This seems intentional, like Butt Light. They wanted Modelo to the place of it especially with all the Mexicans who throw it down. We are currently building a house and they throw their beer cans everywhere.
Last year, I slipped and slid 15 feet down a rock slide while hiking. It was pretty horrible. When I finally came to a stop, I was surrounded by broken Modelo bottles around me that someone had chucked out a car window into the trail. It was very tricky extricating myself without slicing my hands to ribbons..
I think it is intentional as well. The land value all there restaurants have increased probably 1000% since the restaurants were established and may be worth more than the restaurants themselves. But the restaurant has to go bankrupt so hands dont look dirty in the process.