Similar to Mastodon's spikes last year, it seems. Anyways, there is data to think about. Source
What would be better is if similar Lemmy communities could, by mutual agreement, "federate" so that all posts show up regardless of which community someone is viewing. So if you were looking at lemmy.world/c/technology, you'd also see posts lemmy.ml/c/technology if they "federated" (probably a better term to use to avoid confusion with the fediverse in general, but that's the one that came to mind).