It's the 3rd option: YT follows off-the-record recommendations to avoid potential problems with authorities. There are written, but unofficial, per-country rule

It's the 3rd option: YT follows off-the-record recommendations to avoid potential problems with authorities. There are written, but unofficial, per-country rules and there's a well defined process to squash dissent: ML models analyze videos and comments to find non-complaint users, numerous contractors look at the automated flags and write their summaries, corp employees, up to VP level, review the reports and cancel the non-complaint users.