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.
Yeah, one of the Discords I help with is >450k people. It’s a gargantuan task to moderate, and a lot of it depends on having >20 people (which is another task in and of itself to vet >20 trustworthy people) that relies heavily on the community actively reporting things as well.
It can work, but for legal advice, I’d probably recommend another option.