That's great. I like that you pointed out the obvious. The thing you don't really understand is the bank decided to extend this spending power to us (so that they could make money off of us via interest charges), and then decided that because this movement might "hurt them", that they're going to try and choke us out in any way that they can. What they don't realize is that people don't always cash out on crypto right away, hence interest charges could build on any given "customer" that makes these purchases and has a credit card with a given bank. So, basically, the banks are going to make money, some people are going to lose money, and some people may make a little money off of these transactions.
What's wrong with the above situation? Not much, except for the fact that this is just another example of the banks trying to control us in yet another way. It's a slap in the face to a customer of a GIANT business. We're not a bunch of damn hobos wandering around the Internet, trying to buy our fix of crypto coins. We're legitimate citizens with built up credit, from which the banks decided they would trust us with extended spending power, and then decided they would change the rules because of their personal opinions.
Sadly, my point is probably moot anyways, because you seem to be on the bank's side as it is. Have fun with that.