Board Thread:Support Requests - Getting Technical/@comment-61573-20191230045226/@comment-1038387-20200207135524

You can turn off comments altogether.

You can set up AbuseFilter to not allow linking to YouTube. (AbuseFilter is not very admin-friendly though).

For the rest... fighting vandals is a war of attrition. You can ask Staff and VSTF for additional tools, but for the most part, it's block, revert and ignore.