Personally, I would never have any sizeable amount of Bitcoin on any exchange longer than the required time to clear the purchase. But the masses will never self-custody. They're too lazy to learn or try to learn. Like it or not, that's the way it is and no amount of "education" will change that for most. So we need reliable custodial solutions for them. The ones who can be taught will eventually learn self-custody. Bitcoin is going mainstream, and people will buy it without understanding any of it. So we have to have reliable custodial solutions for them.