Step one of understanding something is to read about it. Which I wish more people did and searched than make so many duplicate posts.

There are so may posts that flip shit and almost every has been calmed down or thought through it, some people get asked for an ID some don't, I wasn't.

Your CC is attached, well guess what. You can only use that to buy apple iTunes or App Store stuff, or sign up for subscriptions. They can't take the information off your account to use it elsewhere. So even if they didn't buy apps off the App Store you could refund them.

Only other thing is if you use the same email/password combo for other things but like others have said but as every one is told you shouldn't do that.

Also I tend to people there will always be a vocal minority and a silent majority. The people who have bad password practices and need something to blame will try and find something they didn't recently even though their information has probably been passed around for years now. (So many things have been hacked think Heartableed, Adobe, Sony, etc)

Plus it's good to check your bank account, keeps you from buying too much random crap and you learn where your money goes.