Banks are the enemies of governments and the main actors in wasting government capital, Banks are fools who only increase their capital and people get poorer,
Banks are the main partners of governments, as both of them work together to increase their own capital (profitability for banks and raise on wages, benefits and jobs spots for government's members), while average citizens get poorer due to losing purchasing power through a weak local currency and accelerated inflation.
Banks can print new USDs/Euros to exchange them against the cryptocurrencies, furthermore banks can provide liquidity services to new projects whether it is a Meme or Pump Dump token. This service of banks could have saved millions of failed projects from failure, Due to which common people are losing hundreds of billions of dollars every year,
Why would they do this? And why would central banks allow them to do this? As you said earlier, banks are only concerned about increasing their own capital. They would never risk their capital in something so volatile, unstable and potentially scammy like providing liquidity to a pump and dump meme token scheme. And actually, common people are losing money because they are fool, greedy or naive for investing in such tokens. It's not even bank's fault in this case.
On the other hand, trading in cryptocurrency increases public benefit, The saddest part is that banks are not providing any services to list cryptocurrency projects on centralized exchanges, For which banks can issue new loans as well as create their own exchanges,
So, the whole point is that you want to borrow money from banks to venture yourself into cryptocurrency trading world? It really seems you are looking for capital to invest, but in no ways it's advisable to borrow money to trade or gamble, because these are very risky activities which don't guarantee you any returns in counterpart, what means you are likely to end without any money and a big debt to be paid to the bank. Better to not mix those things for your own good...