What the point of "street dates" if NOBODY follows them anyway

Super Mario movie (physical release. Digital has been out for a while) has a street date of 6/13

Someone got a hold of one at Walmart . So I figured he was full of bs. I call the one 3 minutes away (Walmart has 4 stores all within a 15 min of radius of me) they said they're putting it out on the 9th. Ok... Close to the street date but not early. 2 other Walmarts aren't putting it out til the 13th. And another Walmart