Imagine owning a profitable business that has for years rewarded its employees rather handsomely.
So a guy comes in and opens a new business across town, selling the same stuff that you sell. And he lures your best employees away by offering them more money and less work. Which is all fine and well. It's a free country. No laws have been broken, the owner is within his rights.
Now imagine that new business owner demanding that you change your pay and compensation plan so that his employees can participate in the year-end bonus payout that your company's owner has made part of his employees' annual compensation.
Maybe I'm reaching for some low-hanging fruit, but this sounds an awful lot like socialism 101.