The upside of this is that it's a big step in crypto utility.

But the downside is to ask what clauses the mortgage has requiring the borrower to top up the collateral or surrender it entirely if crypto prices drop or mortgage interest rates rise. Will borrowers have to surrender their assets at a fire sale price if they lose their job or can't afford to make the payments ?

I have an instinctive distrust of legacy finance companies getting involved in crypto, and this could be a dangerous way for them to increase their BTC holdings at retail customers' expense.