Impressive stats all around. The way that reddit and reddit-likes work with feeds/frontpages you don’t need millions and millions of users for a place to feel active and worth visiting. Reddit was an interesting place all the way back in 2010 when I first started going there, and I imagine they had an order of magnitude less users back then in the pre-smartphone app era.
With more users you get more of an eternal september effect… but you also get tons of people that might frictionlessly see and participate in more nische communities.