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> This request allows us to check if a Google account exists with that phone number as well as the display name "John Smith".

Shouldn't the rate limit be set here, related to the display name "John Smith"? You get 5 "John Smiths" for free in the first minute, then 5 more in the first hour, then 5 more in each day going forward. With the same million phone number combos you'd need roughly half a lifetime (10,000 days) to get the hit on average.



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