Site stats: sharp drop in users on 1/23/20?

I was just glancing at the Site Stats page and noticed that the graph showing number of users dropped by more than 400,000 (~17%) between January 22 & January 23 of this year. Didn’t find this mentioned on the forum after a quick search. Why the sudden drop? Was this the result of a correction to figures that were off, cleanup of inactive accounts, something else?
2020-03-25_8-34-18 2020-03-25_8-38-35

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I believe they started excluding spam accounts in their totals at or near that date.

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Yes, it was removing spam accounts, see https://forum.inaturalist.org/t/exclude-spam-accounts-in-all-user-stats/9263.

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That explains it, thanks. Guess I should have been a bit more thorough with my forum search.

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