this just makes it legal to do so.
When I worked at the law firm, programmers were salaried employees, working 50 or more hours a week and only getting paid for 40. No overtime, and bonus checks were promised, but we never saw them. Some worked as many as 80 hours to meet to high demands of the managers and other departments, which included, yes working weekends and spending the night at work.
This is more proof that the government favors Big Business over the taxpayers who work for them.