It's probably for the benefit of Lemmy that the grow is slow, it gives the servers plenty of time to upgrade. It's already been struggling somewhat with the influx of new users, it may have become totally unusable with 100x, 1000x the user's etc.
I find the size quite pleasing. Sure there are more posts and stuff to see, but here it’s possible to actually have a conversation with someone and not have your comment buried in 3k other comments.
But that being said, I would like to see Reddit crash and burn, so businesse practices like that doesn’t become more common.