One of these blokes fell? Safety first - not No proper equipment or anything wild like a safety harness. Just out of interest, if one fell, would they (Or probably the family) be able to sue McD headquarters? Do McD head office have any clue as to what goes on or is it they just want to know?
I'm assuming they give out health & safety training, ensuring that they are covered. Health & safety training is a bit of a con. We get a shift of liability and also a happier government, who can use it to inflate overall training figures (thereby suggesting that upskilling has been enabled under their watch)
If McDonald's informed the man he would be working under such conditions, and the man agreed to them, then no. At least not in a sensible justice system.