I have at least 6 classes that I have either bought or were free You can watch them anytime 24/7 and never loose them they will always be in Your Craftsy. I get at least 2 emails a week with their offers and I don't have anything in my wish list. That being said "All businesses online Track Your Likes" they are not stalking you. FB is the worst for tracking your likes and that is what you will see as advertising on your FB page.
I wouldn't worry about it but there is a way in your internet options on how to stop tracking you'd have to talk to a Computer person. though.
There classes are wonderful. I hope you enjoy them without the worry of being stalked.