I agree with the girl. If you're willing to steal from a McDonalds, what else are you scheming and how long until those scheme involve me? Theft is theft and I'd want nothing to do with it.
Edit. I don't care about McDonalds, I care about the lads moral compass and how he is willing to show off his "trick" to a first date and just drag her into a scheme. At least wait a while to say "what if we made 3 accounts and just got 3 orders of the $1 nugget deal?"
If the date is cool with it, great f* big corp. If not, you know she's got morals that don't perfectly align with yours - which is okay, as long you respect that and figure it out.
I'll stand by my statement "theft is theft", but I myself also won't deny having some morally gray online activities. However, I wouldn't want to have a first movie date through a movies123 clone. First impressions are key.