I've spent the last couple of years building a "second brain" — a personal vault of notes, transcripts, and half-formed ideas that an AI can read and reason over. Once you've built one, a bigger idea shows up almost on its own, and it's seductive.
What if you didn't just build your second brain — what if you rented it?
The version of this that gets people excited goes like this. You generate a ton of valuable insight at work, and right now your employer gets all of it for free. Imagine instead that your brain is a service other people pay to query. A personal server that licenses your judgment by the use. YouTube, but for your mind — you keep the IP, the platform just takes a cut. A digital twin that keeps earning after you've retired. After you've died.
I really wanted this to be right. I've gone back and forth on it for weeks. Where I've landed, at least for now, is that it doesn't quite work — and the reasons why turned out to be more interesting than the idea itself. I might be wrong about this. If you think I am, I'd genuinely like to hear it.
Start with what's right about it, because it's most of it. As AI floods the world with cheap, passable content, the genuinely real thing gets more valuable, not less. Scarcity moves. You should own your context and be able to swap the model underneath it like a battery. The person who owns their data has leverage the person renting a chatbot doesn't. All true. The direction — toward ownership — is right. It's the mechanism I keep getting stuck on.
Two tests
For something to be a rentable asset, it has to pass two tests. A brain fails both.
One: can you sell it without giving it away? This is where "YouTube for your mind" quietly falls apart. A YouTube video is a finished thing. It's protected by copyright, it costs nothing to serve again, and the law spent a century deciding who owns it. An insight is none of that. It's one of two kinds, and both fail. Either it's the deep, hard-won judgment you can't fully put into words — in which case it never makes it into the server to begin with. Or it's something you can spell out — in which case it leaks the second someone queries it, and you can't charge for it twice. There's no copyright on an idea. The law protects the way you express a thing, never the knowing itself.
Two, quieter and worse: can it be held responsible? Think about what a company actually buys when it hires a consultant. It isn't really the slide deck. It's someone to blame when the deck is wrong — someone standing behind the call with something to lose. A digital twin has no skin in the game. You can't hand accountability to a copy of yourself. And this is the part that changed my mind: the same people most excited about renting their brain will tell you, in the next breath, that once AI does the grunt work the human's real value is the trust and the relationship. Which is the exact part a twin can't hold. The idea quietly argues against itself.
The bigger thing I keep coming back to
Zoom out and something larger is going on. There's an old idea in economics: companies exist because coordinating people through a market — finding them, negotiating, managing them — is expensive, so we bundle all of that into a firm. AI is about to make coordination a lot cheaper. So at the edges, the firm shrinks toward one person running a swarm of agents that used to take a team.
But not everything collapses to one person. Enormous capital, regulatory approval, decades of proprietary data, legal liability when things break — none of that fits inside an individual. It consolidates harder, because it's the only moat left. So the firm doesn't disappear. It splits. Commodity work scatters out to individuals. The capital-and-liability-heavy stuff concentrates.
I spent years in energy, and it took me a while to notice I was arguing from the strongest case for my own side. In energy the moats are obvious — the capital, the regulation, the ground nobody else has rights to. Of course "your IP gets walled off inside the company" felt self-evident to me. I was standing in the one industry where it's most true. In ordinary knowledge work it's already eroding.
There's a tell, too. At big, knowledge-heavy companies, the most experienced people are often the least eager to pour their expertise into an internal AI — because that expertise is the thing that makes them valuable, and they can see where it goes once it's captured. Rational, in the moment. But it's a stall, not an ending. Eventually the company either makes it worth their while or hires people who rebuild the knowledge from scratch. It resolves. Slowly, unevenly.
And even if you solved all of that, "rent your brain" lands somewhere uncomfortable: it's a lottery. YouTube is the honest version of the analogy — a tiny top slice earns almost everything and the long tail earns close to nothing. A world where you license your mind isn't power flipping to workers. It's power concentrating in the handful of minds worth renting, while everyone else's twin is worth about zero.
So what can you actually own?
Here's where I've ended up, and it's the part I actually believe. The instinct to own something is right. It's just aimed at the wrong target. Three things pass both tests:
can you fence it? a throat to choke?
an insight no no -> not yours to sell
your judgment yes — it's you yes -> ownable
proprietary data yes — not online yes -> ownable
your reputation yes yes -> ownable, and uncopyable
Judgment. Not stored — trained. The point of a second brain isn't an inventory you sell. It's that working through all that material makes your calls better. The vault is a gym, not a warehouse. What compounds is you.
Proprietary data. The scarce input was never the insight — it's the raw material that isn't anywhere online. Your own receipts, logs, first-party observations, the relationships only you have. Insights leak. Data you actually own doesn't.
Reputation. The quiet winner, because it's the only asset that's ownable, portable, and impossible to copy at once. You can clone a document. You can't clone a track record. Someone can take your notes; they can't take the fact that you were right, in public, on the record, for years.
So the strategy flips. Don't try to sell your brain. Use it to become the person whose judgment people trust and whose track record can't be faked — and leave the receipts where people can see them.
Which is the least futuristic advice imaginable. But if the next decade really does reward what can't be copied, that's the side I'd rather be building on.
Written as I think it through, not from any settled view — I've argued myself in and out of half of this more than once. If you're building a second brain too, or you think I've got this wrong, I'd like to compare notes.
