Now I'm curious if this would actually be a viable business model, if it'd have any legal or practical issues, and if anyone already does it. Like, there exist companies that collect trash already, clearly that part is already viable, so if information could be collected and sold to advertisers for even a little more than the cost to collect that information, then it would be extra profit for the trash company as long as it didn't negatively impact their core business of trash collection. Could be even more insidious and hard to opt out of than actually having someone look through one's individual trash too, for example, if one could, say, sort out the cans from the trash for recycling purposes, one might also try to have a machine look for brand logos on those cans, and store information about which route a given load came from, potentially giving information about what kinds of beverages people in a given neighborhood are more or less likely to buy.