No it would not, and that I would expect to mostly grow over time, while remaining low in the absolute sense. These are Monthly Active Users (MAUs), as reported by places such as https://fediverse.observer/, which not every instance reports to although the vast majority do. Your reply would count towards your particular instance, and in its particular software category - you can see 30 Active Users reported on it at https://catodon.fediverse.observer/list, and graphs for how that has changed over time for all catodon instances at https://catodon.fediverse.observer/stats, showing it stably hovering at ~100 MAUs over the past year, even rising by half again compared to a year ago (though still only double to triple digits total, nowhere close to Lemmy or even PieFed numbers, or especially Mastodon ones).
Catodon is not typically considered Threadiverse, although nodeBB is and flarum iirc would be if it ever gets around to implementing the ActivityPub Protocol for itself, but perhaps that situation would change to become more inclusive! The concept itself may start to get fuzzier as messages are able to be passed between Fediverse platforms, though it also makes sense to me to have names that provide distinction as well - like Loops is for videos, and Friendica is user-based, so even if you could view that content from software like PieFed or Mbin, the community-based topical (aka threaded) discussion format still warrants a name.
The microblogging format could use a name as well except right now Mastodon is pretty much considered just the default, so that Fediverse==Mastodon to a first degree of approximation, to most people who aren't informed.
I love the fact that we might need new names for these, if the concepts outgrow how they are currently being used! (Sadly, Lemmy has a very toxic userbase, especially Hexbear, and this will severely limit growth from Reddit users who see no reason to join here - or who leave after giving us a chance, while complaining to others how bad their experiences here were while they were here.)
