Though they actively scan your email for targeted ads and correlate them to you outside of your jail through GA, which doesn't really require login. Unless you connect through a different VPN and browser/etc.

Seriously though - who cares? You use a credit or card? Your purchase history has been sold to advertisers and similar for decades, it's just more transparent now.

OP here is simply fomenting mistrust of the more obvious players to draw traffic (and advertising bucks) to their own website (duckduckgo).