I don't think everyone is able.

You've probably heard this before, but I'll repeat it because I'm curuous for your thoughts.

There's a number of ways to demonstrate that self-custodial bitcoin is not currently possible for 7 billion people.

Here's a common one: say each block contains 3000 transactions on average. Blocks are found at an average of every 10 minutes. That means 144 blocks a day, ~160 million transactions a year. To create 7 billion new utxos at this rate would be something like 40 years with every transaction being dedicated to sending btc to a new wallet.

Now maybe you can cut that number in half because of batch transactions, but you would also have to allow for the continued functioning of the network (people who already use btc wanting to do all the things they normally do with it).

Obviously, not everyone on the planet will suddenly decide to try to self custody their sats at the same time, but you can see how if any significant percentage of the world's population wants to hold their own keys, fees are going to have to go massively up, which makes the minimum value of a viable utxo go up and voila: not everyone can hold their own keys.

What do you think?