I think YouTube has decided to go on some sort of purge... I had a second YouTube channel for the "No One Cares" videos, haven't uploaded anything there in over a month. Barely more than a day after the main channel got incinerated for "Community Guidelines", now this other channel got removed as well.
I've heard second-hand that a lot of smaller channels, particularly ones without monetization, have been getting thrown overboard in the same way. No warnings, no buildup of strikes, just bam, gone overnight. I think YouTube must be "cleaning house", as it were.