Sounds like folks with the same mentality of some LEO departments in Mississippi after the open/concealed carry issue was rectified. They hand carried small “No Weapons” decals to many businesses and “requested” that they post them. Such signs are supposed to be readily discernible from at least 10 feet and the 4” x 4” stickers are often lost among other signs/advertisements on windows that might not be right adjacent to the entrance. Easy to claim you didn’t see it and leave if someone notices/mentions your weapon.
When I approach a business I am unfamiliar with I look for no firearms signs because they tell me if I want to do business there or not. However, some places have literally dozens of stickers and signs littering their front facades. In that case I just go in after a cursory glance. If it was that important to them they would do something to make it stand out. Though I do feel bad if I am supporting an anti gun idiot.