We basically already have this in the UK, and is is helpful. But we still waste too much! One of the local groups that I work with (ish) saves huge amounts of stuff from supermarkets regularly that would otherwise be discarded.
As a person who grew up (and currently live) in India and who spent a decade-and-half in the US, to see the amount of perfectly good food thrown away in the developed world is infuriating and morally inexcusable.
Almost all the food imported from the US to India for instance is consumed by the middle class such as tree nuts (almonds) and are not staple foods consumed by those struggling to eat. There isn't that much rice or wheat that's imported. In addition India has lots of tariffs to drive up the price of imported food from the US to protect local farmers. None of the cause of food insecurity is Susie throwing out a mayonnaise container that might be perfectly fine but past the best by date.
I just used the US and India as examples of the developed world and developing world with which i have personal experience to assert that much much more food is wasted in the former than in the latter. It is not about sending food from one to the other but managing it more effectively when you have people desperately needing it in their own countries (eg. Charities/NGOs, Homeless Shelters, Low-Income groups, Schools etc.). It is well-known that in the developed world the economically impoverished cannot afford healthy food and thus rely on cheap junk-food with the consequence that they suffer more from Poor Health/Obesity/etc. which leads to an unmanageable pressure on the healthcare system and a downward spiral in overall economic output. Everybody suffers as a result.
The above linked documentary is pretty good about highlighting the problem in the US. Also watch this documentary Waging a Living to understand how tough life is for the economically underprivileged in the US - https://www.pbs.org/pov/films/wagingaliving/
Finally note that in 2016 France became the first country to outlaw food wastage by supermarkets which should be adopted by all other countries. See https://zerowasteeurope.eu/library/france-law-for-fighting-f... and https://www.pbs.org/newshour/show/is-frances-groundbreaking-...
You have no information about how much waste they produce.
> What other people do is not your business.
We cant comment that grocery stores throw out too much food because it’s not our business?