Most people respond to feeling, not thinking.
The initial feeling w/ self-custody is “if I fail, even once, all is lost”.
Thus people prefer to feel that they are held by a community.
In the developed world, corporations cater to this need for “community & trust”.
So Bitcoin is a challenge to most, because we don’t want to feel that “if I fail, even once, all is lost”.
This is the direction for Bitcoin, sooner or later.