Because they will create their own circlejerk in the fediverse too and people will leave them alone to do it. Instances would likely defederate from a truth social instance if it were federated. They are also in the habit of banning anyone who speaks against their side so it wouldn’t do much good to try.
Federation is a 2 way street! No federation means his users all get to live out their days in a big circlejerk.
it’s not like being exposed to other people’s content would change them in any way
Why not? All the Fox and Facebook misinformation radicalized them once. Why couldn’t they change again?
Because they will create their own circlejerk in the fediverse too and people will leave them alone to do it. Instances would likely defederate from a truth social instance if it were federated. They are also in the habit of banning anyone who speaks against their side so it wouldn’t do much good to try.