Any food served commercially should have reasonable warnings if it is

1) Very hot physically
2) Very 'hot', as in spicy.. like Habeneros
3) Contains ingredients known to be allergens to many people.
4) Is served on a plate which is itself hot (some steaks...etc.)
5) Has ingredients known to be forbidden to certain religious/ethnic groups.

All this is hard to regulate and enforce... all one can do is complain and/or avoid in the future.