Clients are not offered at-will, they either work or they don't. Nvidia ships AArch64 UNIX drivers, Apple is the one that neglects their UNIX clients.
Google used YouTube as a weapon against both Windows Phone and devices running Amazon's Fire fork of Android.
A "monopoly" "service"? What have they monopolized, laziness? It's not the App Store, you can go replace it with DailyMotion at your earliest convenience.
You're still retreading why your original comment was not at all relevant to the critique being made. We have precedent for prosecuting monopolistic behavior in America, but it doesn't encompass services even when they're mandatory to use the client. It does have a precedent for arbitrarily preventing competitors from shipping a runtime that competes with the default OS, incidentally.
https://www.ftc.gov/advice-guidance/competition-guidance/gui...
If you think otherwise, make your case to Google's lawyers instead of spinning hypothetical case law.