Similar to Mastodon's spikes last year, it seems. Anyways, there is data to think about. Source
Lemmy is having an identity crisis of sorts. It was built to be decentralized yet we (users) seem to want to centralize everything and we all go to a few of the largest instances.
Because decentralization, at least as it is now, runs counter to what people are looking for in a social media platform; mainly discoverability.