Alternatively, let people cancel easily everywhere. If you think it’s worth the extra revenue to geofence easy cancellations, then—well, you do you, but you are making a business judgment that the additional development cost is justified. This is different from VAT/sales tax etc., where it is in fact impossible to comply everywhere without discriminating by jurisdiction.

Worse by following NYC laws and putting everyone else in a different harder to get away from bucket you may be setting yourself up for future legal problems. You now have a chain of documentation on your evil practices rather than them just being a norm you may have verbally agreed on before.