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According to this tweet, it was 200-300,000 emails. Absolutely shocking. https://twitter.com/ehasbrouck/status/1473669157681909764?s=21 https://twitter.com/ehas

• jaclaz 5y ago
  That with my (conservative, I believe) estimation would make 6-9,000,000 US$. Let's make it 10,000,000 US$, that were "wasted". Sending 200-300,000 of such mails makes no sense whatever, AFAICT a study (besides the ones with 12, 18 or 33 participants), if the sample is random enough, with 1,000-10,000 should give accurate enough results. In the good ol'times (snail mail) sending 200-300,000 letters would have costed probably 200-300,000 US$, I doubt that the Uni (or its IRB/whatever commission) would have approved this kind of expense.