If the descentralization of social networks continue, we will have to prepare for the eventual rise of the instances wars, where people will start to fight about which instance is better and which one is weird to be in and so on, but that’s for the future of us all.
As horrible as it is the implementation would take Facebook only a few days since lemmy is open source. The “problem” with an open system ist that basically everybody can join
Facebook will definitely hide behind a Facebook logins defederate everything that they don’t like to “protect” their users.