2) This is about cloud gaming, when you're streaming the game from hardware in the cloud, like Xbox Game Pass. Streaming the game from your own hardware isn't as competitive to Apple since it requires you buy a $500 console or gaming PC.
3) The biggest issue was Apple not implementing RCS and defaulting every iOS user to iMessage, which has created a two-tier messaging system, friends getting locked out of chat groups, etc simply because Apple doesn't want to use the standard.
4) "Who cares" is not a valid argument in using your dominance in one market to dominate another, which is textbook anticompetitive behavior. They also do this with AirTags, Airpods, any accessory where the Apple product gets to use integrations with the OS and third-parties are forbidden from doing so.
5) Tapping your phone is more secure because the card number is randomized and single-use, protecting it from replay attacks.