I’m not sure I understand what you’re saying. You can’t just say “fuck off” if your bank requires another browser, or if you want to go to an event and the only place to get tickets is Ticketmaster. It’s not right, but you have to use a browser that works.
Remember that it is purely an artificial limitation. The web has open standards that either browser should be (and is) fully capable of delivering even damn videogames in the browser.
The ONLY reason businesses limit the browser is either because they’re being lazy fucks and don’t want to test on more than two or three browsers and whitelist what they test… Or they’re doing shady sh*t that requires some APIs these guys talk about (not the exact same ones, but same idea).
There are ways to transpile and use polyfills automatically so that even the craziest crap works across all browsers: The only reasons to not support it are bad ones.
I do to my bank. They say firefox dont work and I change my user agent string. Done.
I’ve grown petty and pissed off at companies, so if it was me I’d find a new bank immediately and blacklist them for any future relationship. It doesn’t even matter that it can be handled by tech knowledge and workarounds, the principle is that it shouldn’t need it in the first place.