Bazzite. Literally built for gaming.

Waterfox and/or Librewolf FTW

Who buys a Mac and uses FOSS? I feel like that venn diagram has very little overlap.

PIA got purchased by Kape Technologies a couple years ago. With their track record, you can choose to believe the report issued by consultants they paid, or you can just go to companies with better track records, like Mozilla VPN or Mullvad.

Seems like an easy choice to me.