I doubt they are willing to share user numbers/subscribers being a private company as for all the other stuff there is sometimes updates what started off regularly and monthly is not as often now.
e.g
Clubs update
https://forums.zwift.com/t/clubs-update-oct-2022/591176/25
Competition and AU update.
https://forums.zwift.com/t/competitive-ai-tech-update-september-october-2022-recap/592723/55