I dont recall. I saw it being discussed somewhere and don't recall. I just thought it an interesting idea vs throwaway stuff.

There have been a few business models using reusable bowls/lids for takeout where a deposit is charged and you get it back when you return the dishes. Don't return it, and the money is forfeit so the company can replace what you kept. This could work for delivery, could still do a "hub" or "dash" service, but the return part is on you, since the driver may not go back there.

Alternatively, bringing your own could be doable, as long as it's "in store take out". People just have to realize portions will be by piece or weight, or a measured serving scoop, so bringing an oversize container won't net more food.