Similar to Mastodon’s spikes last year, it seems. Anyways, there is data to think about. Source
I don’t think it’s about a craving for centralisation but for newcomers and people still learning the core ideas about decentralisation it’s about a promise of more active engagement and more varied content.
And FOMO. New users gravitate towards the large instances because they think they will miss content, not knowing they can easily access said content on any instance as long as it hasn’t defederated from them.
It is much much more of a pain to access content on small instances where it hasn’t synced yet. It means visiting those larger instances anyway to check if it’s worth subscribing to communities. And then trying to actually subscribe is a lesson in patience while it gives you no search results and errors out if you try to visit an unsynced community directly.