This is how the tried and true agenda goes using Meta's threads.net and the Fediverse as an example.

• Meta's site gets wildly popular because of corporate backing
• Meta's site does something on purpose to cause poor operability with the rest of the Fediverse
• People not on Meta's site can no longer properly communicate with people on Meta's site, they go to Meta's site
• The Fediverse gets fractured and nobody cares because everyone is on Meta's site
• Meta's site is the sole survivor and the rest of the platform dies.
• Meta enshitifies their site as corporations typically do (think Twitter)

So yeah, ban the shit out of them. The proper term is defederate them, but do it with extreme prejudice.