A bit late in the year, perhaps, but Mastodon had a lot more numbers to share... So, if you’re curious how Mastodon is doing by the numbers, the 2023 Annual Report is finally here:
https://blog.joinmastodon.org/2024/12/annual-report-2023/
"How large is our budget, and where does it go? Who works on Mastodon? What have we accomplished, and where are our priorities for the future? For all of this and more, we’ve got an answer–at least as far as 2023 goes."