"Be your own bank" is a nonsense slogan from blockchain.info; you can "be your own bank" with 50 kg of platinum, gold, or silver.
Trolls who haven't even finished primary school are spreading the idea of Bitcoin as a bank on Twitter and other American social networks.
It's just absurd how they got this idea on how to promote crypto.
I'll share a little bit of story here; In my country there is this famous online game/casino that is currently being promoted by most of local influencers we have here, but the thing is the site is not 100% trusted at the same time the people behind the project is shady yet influencers try to promote it without a care that there are so many that are now complaining that they couldn't cash-out their money. This is the story I remembered when I first saw this post.