In the "all I've got is a million bucks in gold I stole from a vault and can't show a paper trail" case: I don't care. Not a valuable use case for me. That reason alone doesn't move the needle on crypto for me.
In other cases: seems like you're gonna have an easy time getting a loan. lending to people who don't need it is the easiest sort of loan to make.
(In most of these cases, e.g. multiple properties or non-liquid assets, I'm not sure why I want to put down more collateral anyway...)
Edit: you added something about how with traditional banks you have to do it all-or-nothing with a single bank and that's how they "get" you. I'm not sure how anyone's being "gotten," especially in recent times where rate competition has resulted in cheaper money than ever before. But it's also not true in most of the cases you outlined. If you have multiple sorts of assets that you want to borrow against instead of securing the loan with the property itself, you can take out a bunch of other loans on those other assets and pay cash for the property.
Then you bring up historically marginalized communities and such... If you could sell me on the benefits for most of the folks in the world, people who may only have 5% down compared to a traditional bank... that would be a different convo, but "additional ways for people with assets to borrow money" doesn't sound so interesting, as it is.