One example is when Google got the third party YouTube app removed from the Windows Store. Google had refused to make a decent YouTube port on the store, and so a very well made third party one was introduced. It had all the features that YouTube Red boasts today, but it didn't support ads. This was not because the developers were trying to make a play on Google, but because there wasn't an API to serve ads. They mentioned they were more than happy to comply, but were served a C&D and the app was killed.
like how you can't view amazon prime videos from android tablets (or at least, certain versions iirc.. amazon yanked it's apk from play store. i dont recall why, but some people simply side-loaded from amazon store).