The spread of digital money is undesirable for banks, given their current problems, which they have faced recently. Speech, first of all, is about low demand for loans, lower profits due to lower interest rates
Bitcoin potentially undermines the work of banks. Probably the general fear among banks regarding Bitcoin is that it completely destroys the need for intermediate transactions between financial institutions. among the main advantages of crypto currency compared to banks is the lack of the need to provide identity documents for the opening of the Bitcoin-wallet.
Moreover, he noted that blocking technology can not be hacked unlike bank accounts, which makes it a more secure depository.
SO THEY DO!