I am not a betting man and I can't predict the future, but I would wager that fewer people would trust Twitter as a bank than would pay them $8 a month for a blue checkmark, which will probably be required to use it as a bank.
eh, Meta tried to venture out into other things other than social media (per se). They tried facebookmail.com and no one took it up, probably because they don't trust him. Not sure on that one.