Verizon has reportedly sold Yahoo and AOL today for around $5 billion. But Verizon spent $9 billion total to acquire both companies! Today’s sale marks the end of Verizon’s attempts to break into digital advertising. In this week’s Startup Insider, Andy Gordon and Vin Narayanan take a look at the lessons startup investors can learn from Verizon’s failed experiment.   From challenging incumbents to executing new ideas and finding the right product-market fit,…