(0) BANKS ARE AGAINST CRYPTOCURRENCY BECAUSE THEY CAN'T MAKE MONEY FROM IT. Why should a bank, as a commercial organization (a business that makes money from money), be loyal to cryptocurrency, because of which they lose their commissions on transactions?
The reason why banks don't deal with crypto is because the government has not approved it. Some countries have not been able to enact comprehensive regulatory laws that will bring the sector under the control of the government, so they are playing safe by restricting banks from joining the sector. The US ensured that they had a robust law to monitor and control the ETF before it was approved. Maybe in the future, more countries will be more friendly to Bitcoin after they have put control mechanisms in place.