We only store data if you physically sign up to the page and that is just because how wordpress works.
At the present moment only IP address and page views are recorded within the database, this is out of my control and I have no desire to share it.
If you purchase something it will be done through paypal and I may gain your name and address.
This will remain in the database for as long as you are subscribed.
I have enough trouble researching quizzes, I have no interest in finding out who you are or selling or distributing data so for that reason if you provide data on here be assured it is going nowhere other than the recycle bin.