Brigading

Brigading happens when a group elsewhere, a forum thread, a Discord, another creator's community, decides to descend on a video at once. The tell is the shape of it: a brigade arrives in a block, repeats the same handful of lines, and comes from accounts with no history on your channel.

Reacting publicly is what they came for. Hold comments for review, use the blocked-words list, and let it burn out, which it usually does within 24 hours. A wave of mass reports does not remove a video on its own.