The Free Software Foundation (FSF) provides a rebuttal, the supposed decline of copyleft, to assertions from Black Duck regarding the uptake of reciprocal versus non-reciprocal licenses. In the rebuttal, the FSF works to stem a cascade of articles and blogs which have proliferated based on some initial disinformation. While there does seem to be an increase in the use of non-reciprocal licensing in general there are several possible explanations and the rebuttal goes into detail and backs each possibility with data. In short, both styles of licensing are increasing in popularity
(Score: 4, Informative) by Anonymous Coward on Sunday September 03 2017, @01:37PM
Apparently it started here [redmonk.com], and was parroted with commentary here [opensource.com]; those links both come from TFA.
Note that despite TFS's implication, the FSF rebuttal is this 45-minute talk [debconf.org] at debconf17, and TFA is just LWN reporting on it.