What’s the game from the link thumbnail?

Which is better: Junk Store or Heroic?

Hopefully not a dumb question: If Vulkan runs on anything, assuming their game isn’t a Windows (Xbox?) exclusive, why don’t more people program their games to use Vulkan instead?

What does proton do?

I only vaguely understand it as “thing that makes game playable on other thing.”

(And also I have six versions installed on my steam deck whydoIneedsixofthese?)