The thing is, the first thing that comes to the minds of quite a lot of people when they about to buy Bitcoin is how they are going to get rich quick through it, but if scammers hack into your wallet and steal your funds, then you do not even have any Bitcoins to get rich quick with to begin with, even though Bitcoin isn't a get rich quick scheme per se. If a social esperiment is carried out on the number of people hodling Bitcoins in custodial wallets, i'm pretty sure the number that does so would be pretty alarming, it is bad security practice that should be completely eschewed.