@Edent I must admit I'm perfectly happy that big corporates are not dashing to join mastodon, though I'd love to see more "announcement" sources in the public space include mastodon in their armoury.
However, the limit we seem to be approaching (at least on photog.social, maybe others) comes from a lack of financial support from users. The underlying databases grow and eventually need more money. We need more folk willing to put in, say, half of what they'd have to pay Exitter, to make it work.