Some of us are distinctly uncomfortable with that, especially given what has been done to Gmail — your mail is being fed to machines and used to build an advertising profile for you.
Google has not mined emails in GMail for ad targeting for years now: https://blog.google/products/gmail/g-suite-gains-traction-in...
This sounds nefarious, but for all we know you're talking about the people in the To line.
Don't worry; I'm fairly sure it doesn't happen unless you click through a pop-up.
Or something else?
I am constantly amazed and how people trust and defend corporations like Google, given what the incentives are. Why do you think Google provides services like GMail or Google Photos? Look at their revenue streams: it's an ad-tech company.
I'm not sure how you got that out of my comment. I was stating a fact.