Hidden user

Hiding a user is YouTube's channel-level block. Their comments and live chat messages become invisible to everyone except themselves, across every video and Community post you have, and they no longer show up on your Comments page in Studio. You can do it from any comment they leave, or by pasting their channel URL into the hidden users list under Settings, Community. YouTube does not tell them, and from their side nothing changes: they still type, still post, and still see their own words on the page. That silence is deliberate, since a visible ban usually invites a second account.