Well, I've got the same glitch--and I've never downloaded any of their apps even as a trial. Email sent to Saurik, just in case the glitch somehow charges my Paypal account for some damn pricey apps. (Not likely, I'm sure, but...)
Cydia uses user account info to install apps regardless of how many devices you used as long as you sign in with the user account, in this case I used my Facebok account.
cydia has a limit to how many devices you can auth per account..