Transnational lottery. You can lose the paper ticket but never on your account.
I was contracted to work on the EuroMillions. The main issue with paper ticket is ownership. With a digital solution, you can prove you own the ticket. Imagine losing the winning ticket worth a few millions €. More over the licensed stores (“buralistes”) take a fee on each EuroMillions payment. By bypassing them, FDJ got the full profit.
We were a team of three Android developers. I worked from user onboarding to the selection of numbers, until the payment. I posted on my blog post
Nowadays, the EuroMillions application has been merged into a new one combined with Loto