Businesses generally want just one thing: More customers. Offering them a way to potentially generate more customers and dabble in the bitcoin economy as well is enticing. Especially considering it takes very little time to get set up and very little, if any, staff training.
It's not so much about teaching them the way of bitcoin and why they should get some. It's becoming far more about how we can bring them more customers without having to change much of anything operationally.
The biggest challenges are around the point of sale and finding novel ways to integrate into it to reduce any headache for staff or business owners. We're getting there.
Aside from that, the biggest challenge of them all is finding ways to get the everday consumer to regularly use the app and convey the value prop of it. By accepting debit/credit cards in the very near future, this should help, but ultimiately we are laser focused on ways in which (albeit over time) we can get consumers to actually use lightning network to help businesses help them earn more rewards.