Whether the DMCA takedown procedure applies here is important, because it determines who to blame. If the procedure is valid to use in this way, then the MPA is

Whether the DMCA takedown procedure applies here is important, because it determines who to blame. If the procedure is valid to use in this way, then the MPA is who gets the blame for making it harder to get PopcornTime. But if it doesn't apply here and Microsoft is acting outside of that procedure and its protections, then legally and morally it's GitHub censoring a project because they don't like it. Which GitHub's Terms of Service let them do, but the ToS doesn't say the users have to be happy about it. (And it would also be the MPA abusing a legal procedure that was already written to favor them, which is certainly a topic fit for public debate.)