The article mentions the drop since June 2008... AKA, a year after the GPLv3 came out. But sadly, not a mention of the controversy of the new version was made

The article mentions the drop since June 2008... AKA, a year after the GPLv3 came out. But sadly, not a mention of the controversy of the new version was made (directly). Some interesting points about the change in focus were made, but I think that v3 played a large part.