This site doesn't have use any analytics or save any data other than the svg you upload. Buying a Cookie Cutter uses Stripe for payments and collects needed payment and address information.
The SVGs you upload are all accessable through a [food-food-food] naming scheme that's very easy to go through. Don't expect any cutters you design to be private.
If you want to keep your cookie cutters secret, you can find the code here