The latest pixel devices (since 6 I think?) already provide accees to a /dev/kvm device, so maybe you could even run a normal Ubuntu server VM on your phone for hosting these services.

I think the admin of c/selfhosted is the admin of Lemmy.world

What kind of “control” do you mean? Your posts/comments get replicated across all the other instances. You can’t really “guarantee” a delete, since the other instances might just ignore your request for delete.