And the danger of a lot of people on a single instance is really exaggerated. If things go badly on, say, a Lemmy instance that most people are on, they can just move to another one with the same features, same UI, and similar access to content.
See, for new users, a slow glitchy instance means “fediverse don’t work like advertised”… sorry, but if you haven’t noticed, the techies are the ones that stayed on Lemmy. Everyone else pretty much left it after the big Reddit migration wave hit it. Glitches, bugs, unstable instances, instances going dark… that’s just not for everyone. Yeah, we understand the reasons, so we stayed, but for normies, this was generally a bad sign and just left.
That’s why it’s advisable to distribute the load, so we don’t get into these same problems, which of course just gives the fediverse a bad name.