In which kind of bubble do you live where not making web apps available for your clients is seen as an extreme violation of freedom? As long as it is possible to go to the bank to do whatever you need to do, I do not think politicians have anything to say.
Sometimes you don't have to, but it's much more convenient. For example, I can use my bank app just with my fingerprint. To use the web app, I either have to login with my phone (reading a QR code) or have to use one of those devices where you insert your card and enter a couple of codes (if I find it...).
If some bank tells me I have to use certain app to make business with them, it's my choice to do it or not, but they are not violating my freedom. And I find saying this is an "extreme violation of your freedom" insulting for those who are actually seeing their freedom violated.
Sometimes you don't have to, but it's much more convenient. For example, I can use my bank app just with my fingerprint. To use the web app, I either have to login with my phone (reading a QR code) or have to use one of those devices where you insert your card and enter a couple of codes (if I find it...).