Key reasons this was accepted (in my opinion, anyway):
1) Stripe employee.
2) Very clear product. Potential market is huge and has money and is willing to pay for this service - they already pay banks for it. First successful product in this market will create huge barriers to competition by essentially setting the standard in banks. Also very clear descriptions of how/where they are tackling the problem shows a lot of understanding.
3) Second time founder, already built a successful product - Giftly.
1) Stripe employee.
2) Very clear product. Potential market is huge and has money and is willing to pay for this service - they already pay banks for it. First successful product in this market will create huge barriers to competition by essentially setting the standard in banks. Also very clear descriptions of how/where they are tackling the problem shows a lot of understanding.
3) Second time founder, already built a successful product - Giftly.