Its definitely a concern. IMO the lemmyverse is far too centralized at the moment. The big questions are:
Is there a trend toward centralization, or away from it?
How are people being introduced / onboarded onto lemmy?
What can we do to combat centralization?
(1) I’m honestly unsure, and I’d def appreciate if anyone has done a study of it. We’ve seen a big growth in single person / smaller topic-focused instances, which is a great thing, but if their communities aren’t growing, we need to figure out how to reverse that trend. I’d have no problem with the current large instances, including this one, as long as the long-term-trend is away from them.
(2) Is mostly word-of-mouth, join-lemmy.org, and apps / web-ui’s which show an instance by default.
We’ve made the sort for the join-lemmy.org instances page be by random active users, and tried to emphasize on that page that it doesn’t matter which instance you join, since most federate, and can subscribe / connect to any community. I hope that helps, and we need to replicate that wherever we can.
Apps and webUI’s mostly just show lemmy.world rn, where they should show random instances. I’m guilty of this in Jerboa as well (showing lemmy.ml by default), and I’ve just opened up an issue that it should be showing a random server for anonymous users.
But I think we need to do more, and I’d def appreciate yours and anyone else’s ideas on how we can combat centralization. We need to get ahead of this problem before it gets worse.