[samhh]

They're also platforms without Game Pass i.e. with much less competition.

[yokoprime]

There is Arcade for macOS/iOS et al, but no AAA titles or anything like that

[qsort]

Yeah, Arcade's selection is very lackluster. I have it as part of my Apple One subscription and I personally enjoy it, but I'm not much of a gamer and I'm pretty sure most serious players would rather have Game Pass.