lemmy.world is already the biggest instance, why direct people there? It wouldn’t be any different than a centralized platform (Reddit) if all the newcomers register there. Direct them to other instances instead.
Does .world need more users? I thought it was already the largest instance. And why would you want to pull people from their home instance to .world?
I want .world to be bigger than Reddit and Facebook. More people more niche communities. And to be honest with you I really don’t care about the other instances because once they see world get big enough they will come on over to here.
ActivityPub is a protocol for decentralized platforms to talk to each other. What you want contradicts with what the protocol was designed for. This pretty much means you are just looking for another centralized social media platform, in that case the Fediverse is clearly not for you. Please go back to Reddit or Twitter or whatever and never look back.