The popularity of this viewpoint may be due to the current Earl of Oxford being a fervent supporter of the movement, or it may be due to the newer bunch wanting to disassociate themselves from people like Ignatius Donnelly. In a nutshell. So to speak. One may have been a collaboration.
Collaboration is almost certain in more than one play, too.
It doesn't do much to explain the authorship controversy, but it does draw attention to some of its funnier moments. To thy sweet will making addition thus. It's in Shakespeare. Fenick Below is a fairly brief synopsis of the arguments of some of the more prominent anti-Stratfordians, carefully arranged for the purpose of laughing at them. Though many of these date back to the turn of the century, this is a controversy which is still going strong, despite the dismissive reaction of anyone who actually studies Shakespeare for a living.