The knowledge of what you do, where you work, who you talk to, what you eat, who your doctor is, where you shop, everywhere you go, what diseases or disorders you have, what kind of clothes you wear, what your family life is like, etc, are incredibly valuable to a company trying to show you ads. It doesn’t matter if you don’t see them through Gmail. Google owns so much of the internet, you’ll see them eventually.

Get your email from an email company, not an ad company.