This is how I've always understood the situation. Their legal team received specific titles that violated the clause. They removed them immediately to avoid legal action. Titles were removed completely because their covers were part of the problem. Comparing it to the DMCA purge is accurate as titles were removed with no notice that time, as well. Only difference is the removal of pages because of the covers.
Banning users for making mass reports is the staff preventing you from cutting off your nose just to spite your face (but it's also rule breaking behavior). You want the content here, they want the content here (staff expressed disappointment on discord). They're just not willing to go to jail for you (literally from staff on discord "The immediate concern is not going to jail").
Take it from someone who's been here since the beginning. Users are making a mountain out of a mole hill here. This is smaller than the Jaimini's Box tantrum. This is smaller than the hacked site. This is smaller than MD being down for a year+. This is smaller than the DMCA purge.
so by mangadex's own rules, they, who were never involved at any point whatsoever clearly have no right uploading anything.
Users upload chapters of their own volition. Staff are free to work independently with user groups. That may be why you see staff upload chapters to MD. Telling staff that they can't scanlate anymore just because they volunteered to moderate comment sections would be stupid.
Good that you're here, what happened to the English chapters for Kumika no Mikaku? Your group scanlated and uploaded those chapters. Some folks were asking about it a page or two ago.