The billing address block is easily bypassed. Even as somebody who's made absolutely no effort to get into scalping, I have at least another four addresses where I could get a FE delivered between work and family members who'd help out, along with new payment cards to use for the transaction. People on a Discord server I frequent have certainly been bragging about how many cards they've got from that source, and there are always a bunch of FEs on Ebay after a drop, usually from seasoned scalpers if you check their other items. To be clear, I'm not saying that I don't appreciate the effort being put in to stop it happening, but the reality is that no system is foolproof. The determined will find a way around any check when there's so much money to be made.