#1 - No... They're not the first ever to be banned, but you gotta be a pretty big thorn in Ghost's side to get banned.
#2 - Odds are likely if they spent money on the app for their phone, it was their intention to product fake product. It's kinda like saying "Did they go to the flea market looking for counterfeit stuff, or did they just happen to see what was there and make an impulse purchase?"... Odds are likely if you know something is bogus, you're doing it with intent.
#3 - Let them try to come back. Ghost approves all memberships, and if you notice in the lower right hand side of each post, next to Report to Moderator, there's your IP address or if you're viewing someone else, it says "Logged"... It's really easy to check to see what a person's IP is with website admin tools, and I think these goofballs aren't really smart enough to use any of the multitude of bypass options out there... So they won't be back.