Just a small correction here. Millions of people use the Fediverse.
Whilst Mastodon brands itself as it's own platform, it's really just one of the many freely available solutions that are used to socialise on the fediverse.
It's a shame that they seem to make an effort to hide this fact when other solutions such as Pleroma and Misskey make it very clear what the Fediverse actually is and that you can use a vast array of software to connect to it.
I actually based that on my memory of the last time I checked fediverse stats. It's currently 1.6 active and about 4 total. Okay, not millions plural if we're only counting active users (and we know MAU is only meaningful to capitalist entities that don't care about people who log on regularly at > month intervals), but certainly enough to suggest some people care, contrary to the post I replied to.
You would have to put something forward to show an effort to hide the existence of other compatible AP implementations before I could comment on that, but I certainly haven't seen it. Mastodon's own joinmastodon.org has two testimonials making it clear the fediverse is larger than Mastodon. And I 100% agree with them: it's the best of those I tried, and I tried them all.
A lot of people confuse a lack of promotion with hiding. Maybe you've made the same mistake here. Mastodon's own blog and documentation regularly mentions the fediverse. All of this is extraordinarily beside the point of the post you replied to, so that's the last I'll say here on this topic.