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.
Lemmy and Kbin are hopefully gonna grow and become better than Reddit has ever been, but they’re not there yet and will be a while before it happens. Specifically, moderation tools in both platforms are reportedly weak at the moment, with a long list of features yet to be implemented. So while i do want the so-called Threadiverse growing, if you’re in a moderating hotspot as your post mentions, you might wanna consider this detail and check if the current tools as present are good enough or not, it might be enough for your needs with what exists already but frankly the subs I’ve modded have been tiny and i don’t have the mental model to tell you if they are already.
I too urge you to not choose Discord for this community for all the reasons stated. Plus it’s the wrong tool for the job, it’s “chat”, not “forums”, it’s by it’s nature impermanent and for ephemeral conversation. Hell, a good old forum will be miles better than Discord for this.