MAU has to be done sort-of retroactively: you could say "given the accounts we now know to be bots and have removed, what percentage of January 2022's MAU were

MAU has to be done sort-of retroactively: you could say "given the accounts we now know to be bots and have removed, what percentage of January 2022's MAU were inauthentic". Sometimes bot accounts will do organic-looking behaviour for at least a month to evade automatic detection, before doing explicit bot-like things (following particular accounts en-masse).