sure they're leaving but...where? what's a viable alternative?
I mean if I had it my way everyone would just go back to IRC, I still use IRC. it's great, nothings changed, it's perfect. combine that with like mumble or teamspeak and you're good to go.
I checked out Stoat lastnight and it's very slow. took well over an hour to get a verification email (I assume because many others were signing up) and the current server offerings are minimal. Also a good majority of the themes listed simply don't work. it's growing and I'd say it's the best alternative right now but it's not there yet and I worry it or the various instances of it could hold up if there was a massive Discord exodus.
Matrix is a no and xmpp ain't much better.
welp there ya go! problem solved.