Judge Yuri 👩🏻⚖️Oh! I see... So, now if you're subscribed to a YouTube channel and they do a collaboration, with a different channel, it appears on your Subscription feed. Like, even if you had no idea the other channel existed.
All right, ok, that's neat-o.
Gulleko@Yuriel Most of the time it's neat, but I unsubscribed from a channel that does good video essays because they use the collaboration feature to shove their fucking podcast channel into my feed. I do not want to listen to your horrifying current events/politics podcast. 
@Gulleko Ah ha! The other shoe drops.
Yeah, what Youtube REALLY fucking needs is a way to block channels.
It's been what? Two decades, and still no such feature.
(Now that I think about it, they will never do it. They don't want you to control what you see.)
Fuzz-RaThere actually is a "Do not show me this channel again" option but it's not always easy to access and you're straight out of luck with shorts most of the time.
If they were doing more than giving lip service to the idea it would be available when you're removing something from your watch history.