Before the Reddit exodus, I don’t remember many active servers besides Lemmy.ml and Lemmygrad (there was Lemm.ee and Lemmy.ca but they both had like 3 posts a week). Hexbear wasn’t federated, and servers were mostly being desperately spun up in anticipation for a flood of users who would crash the network.
The donations being down is bad though. I would love for at least Lemmy.ml to sticky a post asking for funding; one has to look no further than Thunderbird to see how well that works.