I blame unfederated subscriber counts. If you look up any community from an account on lemmy.world and there is a local version and a remote version… the local version LOOKS bigger when it’s about half the size because the remote version only shows subscribers from lemmy.world whereas the local version shows subs fediverse-wide.
If sub counts were apples to apples for remote and local communities, people would much more frequently sub to the bigger remote comminity. But lemmy.world is so big, that when people are subbing locally because they’re confused about which is bigger… the lemmy.world community actually becomes bigger very quickly. So it’s winning the community scaling races consistently on pure confusion. The resulting community centralization is not all that healthy and they often overtake better run and more established communities for no meaningful reason.