They rely on easily accessible sources. In a previous job, I've written copious amounts of C# and Java, which will never ever show up in their search. Everybody

They rely on easily accessible sources. In a previous job, I've written copious amounts of C# and Java, which will never ever show up in their search. Everybody knows there's a huge bias when you want to conduct a survey and only ask people in the square in front of your house. But when it comes to estimating tech-related things, all caution is thrown out of the window, because "there's so much data."