It's still too early to tell anything, hope they come back too!
The Lemmy ecosystem is weird because there are so many Lemmy tools maintained by a single person yet at the same time the majority of Lemmy's user base is tech-savy (we're mostly nerds working in the IT field) and we should be inclined to collaboration rather than competition, considering the amount of criticism about western capitalism here.
The reason may be that many projects started out as experiments/for fun, or that we are unwelcoming to new contributors, who knows...