I expect they will deprioritize outside content so that anyone that wants to reach a wide audience has to migrate to threads. Since other instances will likely treat threads content as any other, this will mean you can reach everyone from threads but only outside instances if you don’t use threads. They will suck up users from the fediverse this way and then defederate.

This is why I would not federate with threads unless there was a legally binding commitment to treat the content same regardless of server of origin.