“To solve this problem, we have re-engineered our entire login process to never send the login password to our server, which has the added benefit of helping protect against MITM (man-in-the-middle) attacks.”

https://proton.me/blog/encrypted-email-authentication

Steam has Proton now which is a god send for Linux gaming. https://www.protondb.com/ which is just a setting in the Steam client.

For games it depends on what might interest you. If you are into history sorta stuff, maybe Civilization V or VI? If you want more of a fun game that a lot of non gamers play, you try The Sims or Stardew Valley. If you want something like the current trend of games, try Helldiver’s 2 or Baldurs Gate 3.

If you ultimately don’t have a preference. Just browse the sales on steam for games that look interesting as well as browsing https://www.humblebundle.com/ which can sometimes be good. Just check it against that protondb or look up if the game runs good on Linux first before purchasing.

Mullvad or Proton. IVPN is also good.