A while back Taco Bell and T-Mobile was doing some promo where you could get a free taco each week (or something like that, it's been years) for "T-Mobile Tuesday". The code wasn't unique, but it's use was tracked on the TB account. TB at this time also didn't have a captcha for new accounts.
I also had a Google Workspace domain that had its email rigged to accept and deliver any email sent to its domain regardless of what was before the @.
A bit of C# later and I had a Taco Generator going, on command it would generate however many orders at whatever TB I choose. I'd just roll up and say I had 12 orders for cm0002 LMAO
No one ever said anything until the one time i pushed my luck and had it generate 24 tacos, then the manager was like "Better not be this high again, I'm cool with the 12"