I use a service called Privacy.com which is quite convenient for certain types of transactions or when dealing with certain merchants. Check their privacy policy: https://privacy.com/terms#privacy-policy

The one thing that stands out to me is this line: "Privacy.com does not disclose personal data to third parties for direct marketing purposes."

I am suspicious that the addition of the word 'direct' in that sentence might be significant. I'd love to hear of other similar services.