@pomstan @PhenomX6 @xianc78 @alex @gnusocialjp No, because Gab defederated and stayed that way.
And Poast just lies about who they defederate.

The idea I can agree with is that you can have a community of friendly instances.
So the auth-left have their echo chamber, the auth-right have their echo chamber, the libertarians have an own space with without authoritarian lunatics interfering, the centrists can choose whichever side they want to federate with.

This completely eliminates the possibilities of hostile takeovers by wokies which we've all witnessed with big tech, the gaming and comic industries, the loycaloyzers, and so on.

Though I didn't say it should be the only way, which is what I'd disagree with on Alex's take.
There are cases where you want to have federation with everyone by default, which is why choice of software you want to use needs to be available.
For example, want an open door policy? Install Fedi software X.
Want a private and invite-only community? Install Fedi software Y.
Want both? Install both on 2 different servers or 1 server under different domain names.