The interface indicates that sharing can be done via P2P or server. Since I cannot select the server option, and both my friends and I have stable internet connections, I left it on P2P. I successfully tested streaming in 1440p/60fps on Warframe and Nioh 3, and the stream was remarkably smooth, even during scenes with heavy visual effects.

I think TS3 is bundled with Overwolf, but not TS6. I can be wrong.

True. At least it’s self-hosted. I just hope some real alternative to Discord comes soon.

Switching to a self-hosted good old Teamspeak 6. Their screen sharing is very good, and audio quality is far above Discord. Overall it’s still need some polish but is okay.