Right, but telling people they don't belong here is going to make people think they don't belong here. If there's less content to interact with, there will be fewer interactions; fewer interactions will make this place look (be?) dead. It's the same reason I can't get all my friends and family on Signal instead of (blech) SMS. They want to be where the people are. I much prefer something using ActivityPub and federated than something not, but I also want content to interact with. If I don't get that here, I'll go elsewhere.
So, let's try not to tell people they don't belong here, okay?