Why is your app better than an OTA?
Probably not always better.
In my personal experience it was better (several European rentals, including one-way rentals).
I'll post here screenshots of a 4 day one-way rental in Italy incl ALL insurances.
I'm B"H a top tier Avis and Sixt member, but their prices were literally 400% - 500% more.
Fun fact: I did get a double upgrade.