It's unfortunate that it's probably impossible to get an actual human being from YouTube to explain exactly why your comment is being removed.
this is deleted
>I just googled .... and it's called ..., was listed as #1
this is not deleted
>best flash games of all time
this is not deleted
>IndestructoTank
this is not deleted
I think it's a bug in their ingestion pipeline. Just a guess. Or maybe it really is an edge case in their spam detection garbage.