It’s unlikely to topple Reddit regardless, but so long as the scalability proves functional enough to support recommending lemmy.world to non tech-savvy newbies I don’t see this particular issue becoming problematic. Most of the larger recommended instances have open community creation anyway. I guess BeeHaw doesn’t but people aren’t really recommending it to newbies either.
Lemmy.ml has c/Community_Requests and I think it’s about time we had that on .world too.