You’re applying the political science definition of ‘federation’ and not the computer science definition. They are different. Federation in CompSci terms has to do with networking providers using standardization to interoperate, which is exactly what the fediverse does.
Yep. Musk is basing his idea about having an “everything app” on WeChat’s success in China, which basically does what he’s talking about. The problem is that he doesn’t seem to understand that there are cultural differences at play between Chinese users and western users that prevent mass-adoption of a single app to do everything in the west, and that WeChat already exists and isn’t popular in the west at all.