User blog comment:DaNASCAT/Technical Update: February 20, 2017/@comment-26923519-20170222034847/@comment-126761-20170222161956

Indeed, it was always intended as a limited-time test. It was not coded as a permanent feature, and would have had to have been super-effective for us to consider leaving it up longer (it wasn't).

We're using the excellent feedback and data from that test as we discuss and plan future tests and updates.