Like those who are of a certain gender and are charged more?[1]
Or those from a certain zip code who are charged more? [2]
Or those who drive a certain car model who are charged more? [3]
How is email address any different?
[1] https://www.nerdwallet.com/blog/insurance/teen-boys-high-car...
[2] http://www.latimes.com/business/autos/la-fi-hy-ten-worst-zip...
[3] https://electrek.co/2017/06/05/tesla-owners-insurance-rates/