[griko]

I did a similar thing back in college at [insert fast food franchise name].

One branch I went had a poster that roughly says "enter our mobile app survey and get a free meal", so I connect to their public wifi, downloaded it, enter the survey, and got a text message that can be exchanged on the cashier for some decent fries and other stuff. Later I learned that the app limits one submission per device per day, so few days later I start bringing friends to submit on their phones and got ourselves a free lunch. We did this once or twice a week so the manager doesn't get suspicious.

Then one time I accidentally got disconnected to the wifi after submitting, tried reopening the app and to my surprise, it allowed me to submit again. I guessed that they limit submission per IP address, so I tried reconnecting to the wifi and the app limits me like before. Me being curious, tried using a VPN and it didn't limit me both on wifi and mobile data, so that means I can do four submissions per day per device. Imagine how many meals I can get.

Few months later, the poster was removed, then later I learned that it was also removed on every branch in the city. The app just shows a blank white screen. Today I tried downloading the app and it still shows nothing.

[tgsovlerkhgsel]

> Imagine how many meals I can get.

Over the medium term, not significantly more than the (stupid, but apparently intended) limit of 1/day, rate limited not by technical but by biological means.