I have a quite common name in my country and snatched [email protected] for that name many years ago. Many use it by accident somehow when registering for things. Possibly (hopefully!) half of all leaks containing my email address are for other people. Never thought of what it might do for ad profiling, but hopefully it is adding at least some noise to it.

Maybe I could manually improve a bit on that by deliberately register myself for various random services and just clicking around a bit to pretend I am interested in things I have no interest in. On the other hand with 20 years of tracking I think Google has all my interests and habits nailed down anyway.