I think it's very possible now to use bitcoin as a collateral for obtaining credit facilities.
Although I can't say of any bank accepting it as a collateral but I know of many cryptocurrency platforms that do accept bitcoin as collateral for fist loan.
Hopefully, banks will follow suit in the nearest future.
other banks nowadays are now teamed up with crypto therfor its safe to say that these kind of banks are also accepting bitcoin as colateral . bitcoin is a currency a legal currency that has a big value , so how can they manage to ignore it ? they dont think that bitcoin is a scam but they think that bitcoin is rival to their business .
They already have the knowledge nowadays, so its very possible to use it as collateral, we just have to wait for some more time as adoptions
will take place after more new investors showing up, bitcoin already have its own identity and the value already gained attentions around the
world, so for sure it will be a good collateral.