I'd be free to not buy from them if they released iMessage and facetime for android so people wouldn't get kicked from groupchats and prevented from being able to video call their grandmother when they switched phones.

Google hangouts / gmail works fine on iOS and android. Same for whatsapp, zoom, signal, etc. Heck, even microsoft teams.

Apple has more money than any of those companies, and yet also has the wildly most anti-competitive restrictive software, ensuring almost all of its services (apple music/books/iMessage/facetime/etc etc) more or less require all your devices to be apple devices.

I don't know if it's abusive, but it's certainly putting more chains on the user than any of the other similar ecosystems.