If you use Google search or Gmail, they read everything you write, and aggregate that into data packages not just for ads to show you, but even aggregated demographic data to sell for ad targeting.
Regardless of whether the ads reach you or not, you as a data point add to the count that make the package enticing to advertisers, so you're helping them sell the package anyways.
alt Hacker News
If you use Google search or Gmail, they read everything you write, and aggregate that into data packages not just for ads to show you, but even aggregated demographic data to sell for ad targeting.
Regardless of whether the ads reach you or not, you as a data point add to the count that make the package enticing to advertisers, so you're helping them sell the package anyways.