To clarify, blocking a channel, will only stop the user from seeing & commenting on content you've posted. Blocking a channel may not necessarily impact recommendations. You can remove recommended content by selecting "Not interested" on your home page. Hope this helps.
Replying to @TeamYouTube @LordClaros
You should have it so you can't see the videos of a channel you blocked
3:18 PM - 25 Mar 2019
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