A subsidiary of Verizon Communications is pitching advertisers on a service that would scan more than 200 million Yahoo email accounts to provide information on consumer behavior, the Wall Street Journal reported.

The offer also extends to AOL Mail, which Verizon’s Oath owns along with Yahoo, according to the news organization. It may heighten scrutiny of broader data-collection efforts by tech companies, which have fielded criticism for their handling of personal information and are developing enhanced privacy measures in response. Google, for example, said last year it would quit scanning Gmail accounts.