You're saying I can use Revolut in the Firefox on, say, Fedora?

People have genuine reasons to stay with the provider / platform and usually browser doesn't cover half of their use cases.

For example I have to use Revolut because it's one of the very few banks that allow me to use Garmin Pay and work (reluctantly) on my phone without Google rootkit. Can't use, say, Curve because their privacy policy is alarming (and I had a very very weird/disappointing interaction with their compliance team).

And you've already got a good example with Netflix.