I wish I was so certain about 'facts' as you appear to be.
Have you relocated to CA recently? Have you spent years living in the Bay Area of San Francisco? Vehicles that park and do not move within a certain amount of time are asked to leave and their license place information is recorded at many CA Walmarts.
Bay Area Walmarts
The concept of staying at a Walmart on occasion sounds great as a concept but we have found it is more frequented by
those living in cars and vans (not RVs) who want a safe place to shelter at night.
The Walmart locations near my home in CA do not allow for those
living (not traveling) in cars and vans to shelter. I spoke to the Walmart store managers I have frequented. In larger high housing cost cities, what i cited is not rare and security has had to ask people living in cars / vans to leave after staying on a frequent basis.
When Home Is Where You Can Park It - www.missionandstate.org
For a long while, the Wal-Mart Stores chain was known for its tacit willingness to let RV-ers use its parking lots overnight. In the evening, the campers served as a de facto security force, making sure that no one did anything to give the police reason to come calling. In the morning, the campers frequented the store, often buying their day's food and supplies there. Gradually, more and more Walmarts became less hospitable to the community. Word quickly spread among the van dwellers about which ones you could park safely in without getting in trouble.
The New Homeless: Living Behind the Wheel
Van Dwellers Hiding