Is this the biggest react community? Is being on Discord something they prefer to being on reddit or perhaps a forum?
In it's peak, there were lots of channels for all the different parts and facets, including geo-oriented channels as well.
Now, its mostly just the dancing shark gif http://i.imgur.com/I2CBRBZ.png
I'm a member of the UX Slack (https://www.designerhangout.co/) who have ~6k members, and it's pretty active. It's a cross between a forum and IRC, and (from a user perspective) fails pretty badly because of it :)
A major reason is Slack's limit of 10000 messages per free Slack. So conversations get lost within 2-3 days, there's no way to find them unless you've starred them. With no threading discussions don't happen well - there's a lot of noise (like IRC) which can't be filtered out.
Summary: No way to organise/archive knowledge (same q's again and again); noise of IRC interspersed w discussions, Slack's hard limit of visible messages.
If you're paying 35k/year however, it would be interesting to see how they react to that...