Lemmy is the only decent alternative I've seen, besides the other ActivityPub federators. There was literally nothing else besides Mastadon (I had heard of this before and considered it) and kbin (only know about this since I joined lemmy.) Lemmy had the right combination of features, and a cuter name, so it won the most of us (I believe that's a big part of the reason.)
Every other alternative to the big social media is too niche, and often dominated by a particular world view or specific community grievance. Lemmy picked up a broad sample of users that reddit just suddenly and indiscriminately cut off without a moment for second thoughts. We're not a monoculture the only thing we have in common is we used alternative apps for reddit and we were too stubborn to move to the official app. That gives us a lot of diversity in the community and an edge on passionate eccentricity.