According to this Economist/YouGov poll, 8% of adult Americans say they participated in a No Kings protest on October 18. That is about 21 million protesters, not 7 million.
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Even if we discount it a bit, that's still lot more than 7 million.

Lot more polls at https://today.yougov.com/politics/articles/53277-new-second-term-low-donald-trump-job-approval-government-spending
#UsPol