After 2 months of providing all of the required docs and getting auto-declines, I've talked to their support and they just answered (quote):
"I have consulted our specialist about your account. Our specialist team has determined that this profile must stay suspended due to violations of our Terms of Service. We’re unable to discuss the specific circumstances of this or any suspensions.
Our Google Payments Terms of Service states that Google Payments Corp. reserves the right to change, suspend, or discontinue any aspect of the Services at any time, including availability of the Services, or any Service feature, without notice or liability."
The app has nearly 25k of positive ratings and currently one of the most popular apps for action sport participants.
I frankly don't have any idea what to do, that's super sad.