I'm sure MD can just block uploading to DMCA'd series. If they don't, it's not scanlator's responsibility to not "play with fire" and decide what they're allowed to upload or not to protect the site. If admins think it's dangerous, they can just preemptively remove those chapter too.
While yes, I agree that Mangadex could find ways to concretely stop disallowed uploads on DMCA'd series, suggesting that the uploaders bear no responsibility is kind of shortsighted and a little selfish. Users who are putting material on the site do have a somewhat of a duty to behave responsibly to safeguard themselves and the site they frequent and enjoy from further damage. It's like suggesting that people who jaywalk aren't responsible for any negative fallout because cities could choose to put up railings along the edges of sidewalks away from crossing areas if they were really interested in stopping people from stepping out into the street wherever.
I don't begrudge the uploaders for wanting to continue even though I fully acknowledge that all of this is illegal and has ramifications. But especially in cases where we know a series has been targeted/watched it shouldn't be too much to ask for people to be a little more careful for the sake of everyone, even beyond themselves. Because I'd hate for a publisher to come back and go "well, asking for the series to be taken down didn't work, so I guess the next step is getting the whole site shut down."
EDIT: FWIW, there's a thread on the support board about uploading new chapters for a purged series and it appears that the unofficial ruling is that any series that were only partially cut are likely to be purged completely at a later point and the surviving chapters were only a matter of how the site's back-end lets staff delete things without compromising this place's integrity, and that based on that people probably shouldn't continue to upload for those series. If that's the case for a series that didn't get totally obliterated, I can't see how uploading to a series that was wiped out would be OK and it would probably behoove the groups to not do it in order to save the site staff the trouble and risk of dealing with it after the fact.
https://forums.mangadex.org/threads...rs-after-dmca-takedown.2275614/#post-26269827