As with many other subreddits, /r/LegalAdviceUK (which had been dark since the start of the blackout) has been sent a thinly-veiled threat by Reddit.
So they’ve reopened in order to start moving the entire community of 810,000 subscribers to somewhere else.
As you can imagine there are a number of legal professionals who moderate that sub, and they really don’t take kindly to being threatened. They sign off their reopening message with “Fuck /u/Spez and long live John Oliver.” but for the real fun you might want to look up a very famous British legal case they reference, Arkell v Pressdram 1971.
If that was the only thing Reddit was doing in the midst of this shitstorm, maybe. But they’ve also been slinging threats and accusations around. There are laws against some of those things too, Reddit maybe should try treading a bit more carefully if for example they want to accuse someone publicly of “blackmailing” them.