Technically speaking the digital millennium copyright act (DMCA) requires content hosts to implement some sort of "punishment" feature. So the assumption is that requirement drove this change.
As far as "we" can tell there was an API level change that was deployed in late July and early August. No one on the MD moderation team was made aware that this change was coming nor that it was pushed live. Around mid august the first victim of this change was confirmed and it was found out if a user has 30 chapters taken down by takedown requests their account would lose upload permissions. Yes, that was 30 chapters. Not being hit by 30 different takedown requests, but 30 chapters, of which all could be in one request... So pretty much anyone with a large number of chapters uploaded is an easy target.
As to why no announcement was made, I have my speculations (inset tin foil hat meme here) but I am not going to list them as I got in a lot of trouble the last time i did that...
yet there seems to be no mention of this in the TOS or applicable policies (including the community guidelines) aside from boilerplate.
That vague boiler plate is there for exactly these cases. Just pick out a couple seemingly unrelated section and bam, "we can ban you for whatever reason lmao" appears out of no where. So there is no "need" to update anything because you "agreed" to it already. (though vagueness is arguably a necessary evil)
One of the things about how this was implemented, other than no announcement, which annoys me, is that it applies to chapters uploaded before the great purge and change in policy (i.e. that checkbox when uploading). In my opinion those chapter fall under the previous policy and it was not made clear enough to users that all of those chapters they previously uploaded could get them in trouble even if they did not accept the current terms when uploading. To be clear I am not saying the chapters shouldn't be removed when there is a valid request, all I am saying is that they should not count as strikes against users. TLDR; chapters before may 2025, no strikes; everything after, strikes
cough umpteenth request for More Transparency (TM) cough
LMAO
if this blows up there will be another month or two of transparency before its par for the course again
Disclaimer: Not a mod or staff of MD or NC. The above is the insane rambling of a schizophrenic terminally online individual. Please do not sue me.