Also extra useful: iSponsorBlockTV. You run it in on a server and you can set it up with the YouTube app on all your commercial streaming boxes that don't support browser extensions.
https://github.com/dmunozv04/iSponsorBlockTV
How does this work, how does it get between the client and youtube.com?
It uses the tv youtube app remote control over local network to see if it plays a video, and skips at the right time.