This is what I think: this "service" is rather old, and I'm sure it is not being used regularly by lot of people with recent versions of browsers, so the majori

This is what I think: this "service" is rather old, and I'm sure it is not being used regularly by lot of people with recent versions of browsers, so the majority of those 3.2 million fingerprints were made in older times (when it was being Slashdotted/HNed several times, like today) that's why we get many unique results.