I really thought this was about the DirectX compatibility layer for Linux and was hopelessly lost until a dozen sentences in.
what is it about?
The privacy focused email (among other things) provider
The privacy-focused Swiss email provider
I thought it was about the fork of the Atom editor project.
See, I have the same issue the other way around. Hearing about Proton supporting games on Linux makes me always wonder how I can play games via my webmail account.

By emailing your input? Kinda like chess by post.

Or text based adventures

Frozen Synapse allows multiplayer by email.
Well, proton mail and proton compatibility are both awesome tools.