The banks are not getting wiped out by the silver rally. JP Morgan has not been engaged in shorting the silver markets for years. This is a baseless conspiracy theory, and JPM has also been accused of shorting BTC as well.
The entire narrative is made up and this is really just supply vs demand in terms of silver contracts and shares. I have been actively trading silver since last year and made over $100k and in precious metals (mostly gold) for 30+ years since I first graduated from college so I'm not just an idle spectator.