Let the Banks adopts Bitcoin if they like, but that shouldn't be your own concern and this must not confuse you into thinking that it's safe to use your bank account to directly purchase Bitcoin, because the only way your government can crack down on crypto investors is finding traces of bank transactions that includes Bitcoin or crypto trades.
If governments have made plan to catch those who are involved in crypto then they can easily trace them. They don't have to adopt BTC just to bring people to use it. Although, you have a good point here because history has proved that whenever a exchange or a platform bankrupted and seized comes under government's ownership. They are centralized and have some loop holes in them.
If Banks are adopting Bitcoin it's for their own good, they are simply investors like you, but do not break your privacy because of this, I have my reasons why I don't use PayPal to purchase crypto or use any centralized payment solution to purchase crypto, they can betray you.
You are right, because they can easily imply tax on the BTC user. Because many people use BTC in countries where they have to pay tax, they are finding ways to reduce the tax and eliminate it totally. And some are successful too. That's why banks are making things easier for them because they don't have to spend a lot of time tracing the person making the transaction so that they could be taxed.