I actually started on Kbin.social, but then it got shut down, Kbin died and now fedia.io seems to be the largest one running MBin. I like the interface on MBin and I guess it’s good to have a diverse fediverse with different services, but at the same time, why use mbin when everyone congregates on lemmy instances? The local magazines on fedia are for the most part, quite dead, when compared to lemmy collections. In the end I feel like there aren’t enough people to go around to support many more services like MBin and Piefed.
I’ve registered on a bunch of Lemmy instances, but I stuck with lemmy.ml because for the most part it seemed to have the least amount of downtime IME. Though I think they’re all pretty stable these days anyway.
What you said is very true though, it helps to try out and especially actively use alternatives, since that’s how you end up with software like Chrome (not really but kind of, you get the idea).