The structure of the fediverse (lemmy/kbin/mastodon etc) makes it really difficult for alt-right and troll instances to find a meaningful presence.
Truth Social for example is just a mastodon instance, but everyone immediately defederated (blocked) them, so they have no reach. Hateful ideologies want a large audience on which to inflict their bullshit, and the federated model makes it really easy to cut them off.
And, if you help someone register, take a look at all the instances! It's more healthy for the network if everyone isn't siloed on the few larger ones.