On Reddit, browsing r/All by new would show so much spam, it was really pointless if you just were looking for content. One relied on reddit’s algorithm to show you new stuff you hadn’t actively searched for. The nice thing about Kbin, and the threadiverse in general, is that you can browse m/All by New as see genuinely interesting posts.
Reddit has like, several hundred million users.
I think back in 2012, when it had about 50 million users it was already starting to feel really crowded. So at less than 200k users in the fediverse I’d say that worry is far off.