I was curious about the impact of this:
mastodon.social does around 100k-125k posts per day over the last 2 weeks (eyeballing the number here)
misskey.io does around around 125k-150k posts per day (again eyeballing)
m.s. has 225k MAU
from my understanding is that misskey users tend to make more posts per user, so id estimate that misskey.io alone has somewhere between 150k and 200k mau
(warning: these numbers needs 34kg of salt)