I made it in a food factory. Generally speaking. Big companies still throw out expired bread, and some people collect these things to feed pigs. Generally, those returned during production will be processed twice to make toast, or beaten into dregs to make bread stuffing. But small businesses or private workshops are absolutely unwilling to throw them away. As long as it is stale and hairless bread, they will reuse it to make bread pits, or bread crumbs to make peach cakes, and so on. There are many ways to deal with it. If you don't understand anything, please feel free to ask me.