yeah the stats feel strange for sure
it does sorta like up with bluesky though: 650k posts per day and 1M MAU on bluesky, which is a pretty similar ratio of posts per day to MAU
i got the stats from here: https://fedidb.org/network/instance/mastodon.social & https://bskycharts.edavis.dev/edavis.dev/bskycharts.edavis.dev/bsky.html