[vehementi]

> but bots _should_ be a subset of "false or spam" accounts

Do you mean "they should report all bots as part of their false or spam accounts number", or that you believe logically bots are in fact a subset of the number twitter reports, and so twitter's number is bogus if 50% of all accounts are bots?

If it's the latter, you're missing the point of their mDAU marketing metric. It already has all the obvious bots and non active accounts removed. They're saying, what % of advertising revenue turns out to be from bots.