EVERY FUCKING TIME! WHY DO THE GODS CURSE ME SO? MOST OF MY FAVORITE MANGA ARE DISAPEARING!
And with that emotional outburst out of the way, very sad that so many manga are getting deleted suddenly, from what I could gather with very little searching and some extrapolation I think some TL groups got a little too money hungry and drew a lot of bad attention from publishers and drew their ire, since it coincides with MD having to 'codify' (as they put it, I don't know the word) their rules about advertising aggregator sites and pay-walling chapters due to it becoming a real problem lately, and if that's becoming a noticeable problem internally it's probably started cutting into the publishers profits noticeably as well.
And when a problem starts cutting into profits that's when lawyers start doing their jobs, then no one's happy.