I think the 'bans' are more for those folks that spend days, weeks, months in a parking lot... I see the same cars, trucks, RVs parked in our local Walmart and other large parking lots for weeks at a time! I go to the same WM at least once a week and I notice them parked there... They do 'move' around from spot to spot and are not "camping" by any means.. They are "living" there...
But, they are not doing stuff that makes the national news either.. They are just squatting there until they get enough notice and are asked to leave.. We had one such car in our office parking lot and after a week, we finally had to ask them to leave, as they were using the office buildings restrooms for their bath house and laundry room..
Anyway, I feel for those that are in a situation that requires one to have to do that, but it can't be taken advantage of either..
Mitch