Mozilla is unhappy because the use of browser engines other than WebKit will be restricted to the EU, forcing them to develop two different apps.
For an independent browser like Firefox, managing two browsers is not easy, so it can be forgiven that this could be seen as almost harassment.
Also, the fact that the use of browser engines other than WebKit is limited to iOS means that the use of WebKit is still forced on iPadOS, which also increases the effort for Mozilla.
Where did I say refund anything?
You asked what parts aren’t compatible, and one answer is everything bought for Apple computers, iPhones, iPads, etc. Apps, media, anything that isn’t subscription based.
And windows/Android/Linux all have alternatives. This is not an excuse.
What’s the alternative to $5,000 of DRM encrypted media exclusively served by Apple?
The point of this thought experiment is to understand that sunk cost is a real thing outside of a fallacy.
What media is served by apple only?
This
https://support.apple.com/en-us/HT203375
This
https://www.apple.com/apple-books/
This
https://www.apple.com/itunes/
??? All of that is accessible on both other OS’s
*sigh*
https://www.apple.com/app-store/
??? What’s this supposed to be? Shit that’s on the app store…also exists in the android store, usually it’s a 1 to 1.