If you're hearing a lot about the fediverse these days, you should know: Mastodon is not the whole fediverse and the fediverse is not simply a Twitter replacement. The fediverse is an entire ecosystem, built on something called ActivityPub. Learn more: https://www.eff.org/deeplinks/2022/11/leaving-twitters-walled-garden
pretty sure a nontrivial number of folks don't even know that Mastodon the instance and Mastodon the service are two different things ¯\_(ツ)_/¯
The Web 2.0 takeover by centralized corporate services have severely stunted people's horizons to the point that things like the fediverse are now fundamentally foreign concepts.