Hover a thumbnail on youtube.com and click an icon at the right: "Not interested" and "Don't recommend channel"
< Feedback op YT: not interested in one click
I'm not particularly versed in things Youtube. What is "scheduled videos" and "livestreams"?
Latest update now fixes the plugin so it does work. Sorta.
Sadly it's now become incompatible with the extension "BlockTube" and shows the block video button instead of the hide button on the subscription page.
Edit: Not working on scheduled videos or livestreams.