A bunch of these popped up in my area as well. It was for an online casino app. I just chose one that was closest to my home location because these apps need you to be in the relative region to open and sign up. For instance, some apps only apply to New Jersey residents while others are for New York or PA. Its how all the apps work because gambling laws are different state to state. For example, if I was a NJ resident and I used the app while in Indiana, it wouldn't work because it would see my IP address.
The shops though are one of two that I've found. One for a quick 10 is to highlight your sign up experience with screenshots from your phone. The other that's 20 more asks you to play a few games after documenting the sign up for reimbursement.
You just need to be in the state where the balloon is located to sign up. Pick the ones thats closest to your home address and its ok. Also, once you do one, you can't do it again.