Yeah, I was pleasantly surprised when I saw that as well! I love tactical shooters and have been really wanting to play HLL, but I never bought it because of anti-cheat. Seems like I can finally buy and play the game now :)

Are you sure about Hell Let Loose not working on Linux on your system? The ProtonDB page has many reports if HLL working fine since about a month.

In that case I’m afraid I don’t know any solution, hopefully you’ll find something that fits your needs. If you needed to cast Youtube-videos and such, I would’ve shared my own bodged method that combines KDE Connect, MPV and a regex-enabled fork of “handlr”.

Do you specificly want to cast your screen? Or do you want to cast things like YouTube videos and music?