Strictly personal reason. When the lemmy devs asked for monetary donations I voiced my concern with Lemmy.ml, which they also maintain. In response one of the devs called me a cheapskate, so I decided I'm done with Lemmy until more normal people become maintainers
Edit: forgot to add that it wasn't the only reason. The devs themselves are rather controversial in their beliefs and moderation and I had reluctantly tolerated thoss things up to that point. The dev interaction was simply the last drop in the bucket.
I'm in no hurry. If it comes within a year I'll be happy. If it takes longer I'll probably check it out unless some other app has come out that I'm also happy with.