Customer only restrooms, to make exceptions are being disingenuous to the policy?

Several businesses around here, not just mom and pop shops but national chains have adopted the policy of closing or restricting their restrooms to those who are patrons. But they make exceptions for those who don’t know of the policy (especially if it were changed from unrestricted before), such as parents with small children needing to use it, physically disabled, pregnant women, etc. To say to people “sorry, the restrooms are for customers only, once you make a purchase I can give you the key (or code) to the restroom”, is less than genuine when they actually do allow non-customers to use it without any purchase at all?