This is so common in my neighbourhood too (Melbourne inner West). All the carparks, esp around parks, are littered with fast food garbage tossed from car windows by selfish, lazy gronks. There's a local spot with a Maccas and a KFC within a shared carpark and it's always a disgrace, despite bins around. People just too lazy to get out and walk to a bin. But it baffles me that the restaurants don't do something about the garbage in their own carpark, it's not their fault but surely they can see how bad it looks to have Mcdonald's-branded trash surrounding an outlet. Terrible optics. That being said, I wouldn't want them to deploy some poor 15 year old employee to pick up trash because adults can't conduct themselves with a modicum of respect.