Even with laws like that large companies have a lot of advantages in lobbying for laws. First it's much easier for a large company to get lobbyists because they have the money to hire them where workers and worker rights groups have smaller purses to draw from. Second the things companies lobby for have nice big metrics they can trot out, profitability, GDP or job growth, etc where improving working conditions for industry X doesn't have a nice big number you can trot out or even really benefits everyone in a way they can appreciate where the pro-business side can draw more direct 'regulation X killed this many jobs last year, repeal it and we swear we won't be evil.'