Many banks have begun to integrate the blockchain system into their systems. It's a big step for technology.Banks do not like the crypto exchange for this reason. We learned the blockchain system through the crypto stock exchange.This is a sign that bitcoin is a threat to the banking system since bitcoin wants to replace the banks with bitcoin wallets.
I think they are afraid that they might be replaced by crypto and maybe they didn't want crypto stay in its position and they want to ruin it to fall and not to improve,they think that way.