Here's one of their explanation posts about the situation: https://lemmy.world/post/2923697

All their explanations for why they're constantly down basically go back to them letting it grow much bigger than they could handle, because they decided to be the "savior" of Lemmy. Contrast that with what the largest Mastodon instances did when the Twitter migration happened, which was to close registrations and refer people back to join-mastodon to find another instance. This included the largest instance, mastodon.social, which is run by the creator of Mastodon.

Incompetence is understandable given that it's new software, the sudden influx from Reddit, plus everyone makes mistakes. The bigger problem that I see is the hubris that made them decide that they could absorb all the new Lemmy users and then not ever changing that decision even after it became clear that they had major stability problems. In their effort to "save" Lemmy, they've actually given a lot of people a terrible first impression of it. I've seen countless people complain on r/RedditAlternatives about how Lemmy sucks when the details they provide make clear that it's lemmy.world that they're complaining about.