TS releases do have good audio. Cams in general have a lot of visual problems though; poor color accuracy, warping, incomplete frames, sometimes people moving around, things like that. Also pretty much every cam I’ve seen lately has been covered in ads for sketchy gambling sites throughout the entire runtime. None of this makes for a good viewing experience.

Also, I don’t think I’ve ever seen a cam with subtitles available.

Yes, ProtonVPN still provides port forwarding. They randomly assign you a single port every time you connect, so you’ll have to update the settings in qB occasionally, but it’s manageable.