This has happened once before and they reversed it. But they said this last time too:
The discussions that have happened in various threads on Lemmy make it very clear that removing the communites before we announced our intent to remove them is not the level of transparency the community expects, and that as stewards of this community we need to be extremely transparent before we do this again in the future as well as make sure that we get feedback around what the planned changes are, because lemmy.world is yours as much as it is ours.
Picking a better instance for your main is most advisable. Users can accept that the primary benefit of a free and open source federated service can also sometimes inconvenience them, or they cannot. Complaining about the core mechanic of the technology that literally cannot change is silly IMO. Corporate owned centralization leads to enshittification. Your account age indicates that you know that first hand.