The Washington Redskins have won seven games in two years. Quarterback Robert Griffin III, once destined to be the franchise savior, has struggled with injuries and poor play. As the losses pile up, it’s safe to assume the team’s fans are increasingly growing detached and dejected. Things have gotten so bad in the Beltway that Redskins fans have even given up on proper grammar and spelling.

Grammarly, an automated proofreading company, can use algorithms to check writing for more than 400 types of spelling, grammar and...