[threeseed]

You are in many respects a customer of the browser vendors.

They can choose at any point to harm your business e.g. Apple restricting first party cookies.

[layer8]

That’s a lot closer to a desktop OS update possibly breaking your software. This doesn’t make you a customer of Windows/macOS/Linux.

If an OS vendor would target a specific software that way, however, that also would likely have legal consequences.

[Invictus0]

They're not a monopoly though. Apple can disable safari's video playback capabilities, but somehow I doubt that would kill YouTube's business.

[joemi]

To be fair, Apple isn't killing Epic's business by denying them to bypass the app store, or even by kicking them off the app store. Epic's doing just fine without apple.