This is actually a feature in Reddit for those unaware.
It looks to me like that's functionally just posting in a subreddit created with your name, in which you're the only one allowed to post. So creating a community on Lemmy with your name and you as the only authorized poster would serve the same function.
I'm aware of the feature, it's been around since before I left. I'm saying that it looks functionally like they coded it to be nothing more than a subreddit named for you, in which you're the only one allowed to post. They may have put some sort of flashy nonsense over the top of it, but that's pretty much what it is.