No, easier to just ask a simple question: Does the company respect the access rules communicated via a web standard? No? In that case hard deny access to that company.
These companies don't need to be given an inch.
So should Firefox not allow changing the user agent in order to bypass websites that erroneously claim to not work on Firefox?
Ad block isn’t the same problem because it doesn’t and can’t steal the creator’s data.
Arguably it does. That topic has been debated endlessly and there are plenty of people on HN who are willing to fiercely argue that adblock is theft.
I happen to agree with you that adblock doesn't steal data, but I'm also completely unsure why interacting with a tool over a network suddenly turns what would be acceptable on my local computer into theft.