In the case of Sci-Hub what part of the ToS do they violate? The message cites counterfeiting, which doesn't seem to apply (unless that's a translation issue?). And if Piracy is a violation of their terms then why are there plenty of piracy torrent websites with Twitter presences still [2]? At least apply it evenly.
[1] https://twitter.com/TwitterComms/status/1266267447838949378 https://twitter.com/TwitterSafety/status/1323868590047744000
[2] Not linking directly, just search for the pirate bay, eztv, or any other torrent site. There are at least one or more handles claiming to be them.