Maybe because hamburger implies beef, and the elites are planning to cut off the kulaks from supplies of cow meat. Get used to plant based sandwiches.
So I Googled it... and surprisingly still don’t have an official answer... although I learned a lot of interesting things. Did you know a whopper is worse for you than a Big Mac?
Burger King also has some really funny ad campaigns. One of which they encouraged people to unfriend others on Facefu*k for a free Whopper. Unfriend 10 peeps, get a Whopper. AND, their app sent a message to the person that they were unfriended for 1\10th the value of a Whopper!! haahhahah... Fakebook made them stop though.