Having 90% of registered accounts inactive with only 10% of them actively using the platform isn't exactly 'alive', 'growing' and 'healthy' especially when they occasionally run back to Twitter since they know little social engagement goes on Mastodon. 10 is closer to 0, than 90; Hence "Little to no one".
But we both know it is not just that. Not only they can't help using Twitter more, they won't move to Mastodon for the exact same reasons as I said and Twitter's network effect, hence why little to no-one is using Mastodon. The same tech-folks like (Mastodon.technology) are the ones 'self-hosting' these instances and not the regular users, since they don't care enough to even use it.
Not even the one operating Mastodon.technology could handle it. Might as well recentralize back to Mastodon.social just to save itself from the very low levels of social interaction since Mastodon has already repeated the same problems as GNU Social once again.
That's not at all true. Account activity follows the Pareto principle. It's not at all unusual for any online service to have a large number of inactive users. Perhaps it's different for Twitter, but considering I've probably signed up for it three times and use it approximately never, I'm skeptical.