YouTube is automatically deleting comments that contain certain Chinese-language phrases related to criticism of the country's ruling Communist Party (CCP). The company confirmed to The Verge this was happening in error and that it's working to fix the issue.

Why is YouTube deleting my comments?

In most cases, comments that it thinks may be spam will get hidden and end up in the uploader's "Comments" tab in YouTube Studio under "likely spam". They stay there until the uploader reviews them and either deletes them or approves them. If approved they reappear on the video.

Do YouTube comments get deleted?

All comments on YouTube are public and anyone can reply to a comment that you post. If you can't find a comment after you get a notification, it's possible that the comment has already been removed. Comments can be removed by the original poster, the channel owner, or for policy violations.