Arguably the crypto blowup last year did result in some contagion, being one of the triggers for the US’s recent Medium Sized Bank Crisis. Though, also, arguably that was coming anyway, one way or another.
I think the 2023 bank crisis proves the opposite of what you're claiming. Only 3 banks failed, and of those three one had nothing to do with crypto. It was not a contagion, and people predicting it would have widespread repercussions on the economy turned out to be wrong.
"No contagion risk" doesn't mean nobody would be harmed by a crypto collapse; obviously there are a handful of morons here and there who would get wiped out. It means there is no systematic, widespread dependency of the real economy on the crypto one. I think the bank failures bear that out.
