"They could also have made better guesses about whether the sites they were emailing would be bound by the law, and targeted the emails better." They made no g

"They could also have made better guesses about whether the sites they were emailing would be bound by the law, and targeted the emails better." They made no guesses - they randomly selected sites from rankings of top websites (specifically, from an common academic time-smoothed aggregation of Alexa and some of its competitors). From the study website (https://privacystudy.cs.princeton.edu/ https://privacystudy.cs.princeton.edu/): "The set of websites for this study is sampled from the Tranco list of popular websites and publicly available datasets of third-party tracking websites."