Just because M+ is uploading doesn't mean scanlators still can't. M+ uploads the official published English versions, but the official English versions tend to also be censored and use less than appealing effects. Plus sites like M+ only keep the most recent chapters uploaded and delete the older ones. The idea is to force you to buy the official manga, but not everyone can (due to regional issues or financial restraints).
The MD rule is that the official pages can't be on here, but as long as the scanlators aren't pirating others (especially the official content), it's fine. So if a group buys the official raws and scanlates from there, no rules are broken on EITHER end. A loss of profit on the mangaka's end, sure, but not everyone can buy the official stuff like I mentioned earlier.
Just gotta hope a new group will pick it up.