YouTube killed my largest channel in the niche back in 2017, a new channel I created back in November last year is now also dead although the drop off seemed to come much earlier for that one than all the channels here, it was getting 300 views per day on new videos and dropped to 2 or 3 after 24 hours which was VERY weird. I dont think this niche will recover until they sort it out.
Susan was meant to have said herself that she does not care about ridding of the niche in its entirety. Not sure how true that is but the source was exceptionally reliable IMO.