Most people don't want to see ads... But if they do see ads, they don't really care how it is decided which ones to show... Phase of the moon, random numbe

Most people don't want to see ads... But if they do see ads, they don't really care how it is decided which ones to show... Phase of the moon, random numbers, or the third word of every email in my gmail account are all equally fine in my eyes. However, I do care about what other uses my data might be used for. Therefore, googles solution of using all my private data, but with the opensource code running on my machine within my control, is actually perfect for both me and them.