When you buy premium and then it "runs out", do you get to keep all the games you made?
I don't have premium, but it seems to me that when a person has a week or so of premium left they could just create 200 password-protected games with their favorite settings, and then give the passwords to people in the callout forum for a couple months after they reverted back to freemium.
I have a feeling that there's some kind of system preventing this (given that everyone would just buy one month of premium if this were true), I'm just curious as to what it is.