"Games of skill" can't offer cash prizes. If I made a math tutor app that dolled out real money would this be covered? What if I ran a coding challenge on an a

"Games of skill" can't offer cash prizes. If I made a math tutor app that dolled out real money would this be covered? What if I ran a coding challenge on an app that had prizes? Strikes me that this one will be a hard line to draw and apply consistently.