They have "Promotions" for Gmail, but you can disable them, although I don't think Google explicitly tells you that it's an option. Google also doesn't use your Gmail emails for ad targeting or tracking, as per this quote:
> When you open Gmail, you'll see ads that were selected to show you the most useful and relevant ads. The process of selecting and showing personalized ads in Gmail is fully automated. These ads are shown to you based on your online activity while you're signed into Google. We will not scan or read your Gmail messages to show you ads.
Edit: I have noticed adverts depend on how your access Google e.g. I found the iOS YouTube app way worse than the website in the browser.