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.

They do indeed

With opnwrt you can do DNS hijacking, where you force redirect DNS requests for other servers to your own DNS server. This works as long as they aren’t encrypted (DNS over HTTPS or TLS), which most devices don’t use.

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.