As time goes by, I've noticed the issue with chicken at faster food services too.

I know uncooked and improperly cooked chicken has a HIGH rate of developing bad things, like salmonella. What about cooked chicken?

Is this maybe a health issue?

Or is it just a freshness/waste issue?

Not disputing the claim at all, I'm just curious why I see this so much now. I don't frequent "fast" food much anymore, but I do notice I have to wait a lot longer for chicken items.