FWIW, I've been running a similar experiment (granted, for only 2 years) only instead of specifying the company name I'm using a random term (e.g. purplerabbit@

FWIW, I've been running a similar experiment (granted, for only 2 years) only instead of specifying the company name I'm using a random term (e.g. purplerabbit@domain.com) and found similar results. No 3rd party spam thus far (though I found a few companies that continue to send marketing materials, etc. even after using all available unsubscribe options).