This is especially true in urban/and many suburban California cities. Strip mall businesses will closely monitor and strictly enforce parking because it impacts their own customers.
And they’ve been doing this since the 80s. I was with a friend whose car was towed in Fresno in 1987 because she parked at a strip mall and we walked to the apartment complex next door to pick up a friend. I pointed at the sign, but she was sure that it would be fine for 20-30 minutes. Nope.