The terms of service and privacy policy (https://policies.google.com/privacy) are the contract. And my rough understanding (not based on reading the contract, something said internally at Google a while ago about what is in them) is:
- Your "content" (data in Gmail, Docs, Photos, etc) won't be used for advertising. (Only for personalization, like the Gmail smart compose, asking Assistant about the status of your order, etc.)
- Your "activity" (your searches, etc -- what you can see at https://myactivity.google.com/item roughly) can be used for advertising, though you can turn it off (see https://adssettings.google.com) or delete it. (IIUC, you have more granular privacy controls as a logged-in user as you can delete individual items….)
- Your "content" (data in Gmail, Docs, Photos, etc) won't be used for advertising. (Only for personalization, like the Gmail smart compose, asking Assistant about the status of your order, etc.) - Your "activity" (your searches, etc -- what you can see at https://myactivity.google.com/item roughly) can be used for advertising, though you can turn it off (see https://adssettings.google.com) or delete it. (IIUC, you have more granular privacy controls as a logged-in user as you can delete individual items….)