Better not to eat it anyway.

There's nothing wrong with canned foods due to the canning process, it's the crap they put in the cans that's bad for you.

Companies that process food are always looking for ways to increase profit. The cheaper the ingredients--both as raw stock, and the cost of paying workers, shipping, etc.--the higher the profit. It's no surprise they use literal slave labor in any country where they can get away with it. They know it's happening, they just don't care.