Frankly, I'd hope that Continuum Analytics open sources their development because it might be useful to the larger community
Open sourcing is a requirement of the XDATA program.
Or rather, it's only extortion if Yelp itself is generating the negative reviews.
If you RTFA, you'll see that Yelp employees do write reviews, including negative reviews.
Stinginess with privileges is kindness in disguise. -- Guide to VAX/VMS Security, Sep. 1984