Trust is something tricky in the world we live in. We doubt ourselves, our partners, but we trust governments and strangers and so on. Even so, I do have the strong feeling that AI will help people own their BTC for good. When AI will become as usual as "Hey Google/Alexa/Siri", this (the self-custody BTC) will probably be a sure thing. At the moment the main reason for not using self-custody for BTC I think is human memory and the way it faults in time, in the worse possible way. (I myself am my own memory victim.)