If they’re afraid of that, they joined the Fedi with a fundamental misunderstanding of how its supposed to work.

Yeah I was about to say, sure this isn’t ActivityPub, but the specific implementation of the federation should be an impolementation detail the user should never care about. You joined a federated system. Your content gets federated. Period. Whether said federation happens through ActivityPub, AT, some bridge system or the Binford Content Disperser 5000XL+, that’s really not the point of any discussions so long as the content does get federated.