This is so demotivating and sadly this isn't a one time case.
It has been happening recently to a lot of people where they do nothing wrong and their channel just disappears.
Shame @TeamYouTube https://twitter.com/Lazuliski/status/1026338106235125762 …
Don't even get my started on @Lost_Pause_ .
That poor guy keeps getting DESTROYED by YouTube after years of hard work. Now he was forced to delete hundreds of videos because of it.