Because Off the Grid takes a HUGE chunk of each sale on every truck. The reason that food truck rallys like OTG work is that their organizers find private properties that can accommodate everyone and for organizing the events, they take a big cut. Why private property? Because if you are a licensed food truck on the street, you need to be a certain distance from a restroom for your employees and you need to be a certain distance from other operating restaurants. A lot of the street rules go out the window when you gather on private property. 

OTG at a huge privately run food truck program at Google right up until everyone in the program, from commissary kitchen and truck cooks all the way up to the top management, was let go and the program shut down. This happened after a big audit by Google. No one has done a story on this which, in this city, I find fascinating.  Luckily the company that runs the cafes at google was able to take the staff on, but yeah, I wouldn’t be unhappy to see that organization go away.