For anyone panicking, this is exactly like what happened with the transition from ICQ to AOL messenger, from MySpace to Facebook, from 9gag/etc to Reddit, and so on.
Website makes a mistake, some people leave. Makes another, more leave. Each time this happens, more 'main' people of said website leave. Hell, I already saw PoppinKREAM here, so that's a great start.
So this is exactly how it always goes. The fact it is still here means it's staying. Look at Threads, or Metaverse, whatever those things are. All dying or dead, barely lasted. Lemmy is still here, people are still posting, so just keep doing what you're doing. It's already working.
It's like a ratcheting effect. Every time schmeddit fucks up, we gain a few more. And if you can count on Spez for one thing, it's that he'll reliably fuck up on the regular.
Not sure about the other but PoppinKREAM became known on Reddit during the Mueller probe for very long, very well researched and cited comments mostly related to politics. Their citation style in particular meant their comments got tons of Reddit awards and were highly visible.
Man, those days were awesome. You'd browse the list of online people to find someone to talk to. A lot of the times there'd be no communication possible, but sometimes you'd get to know a little bit about the life of someone in a radically different culture. What a time to be alive.