Two can play this game. Groupon can be boycotted by everyone who is offended by their decision to pull advertising from Trump.
I have to wonder about the sanity of the Groupon executives when they refused to sell to Google after being offered $6 billion for the company considering the the age and depth of the company. All I have ever scene from them are 1/2 price deals for restaurants dozens of miles from anywhere. I never used them and even got off their notification list.
Good luck keeping that business model to yourself! No one would have the sense to copy that one!
I wonder why Google, Yahoo, or Bing wouldn't flat out steel their business plan and go into direct competition. They already have the sales force and name recognition. Google did them a favor by offering to buy them out before they turned the screws on them.