you can see Jakes trademark record here
The interesting thing I noticed was the filing date - days after Inktober ended. Jake encouraged people to make use of his logo, etc. knowing he was trademarking it. for those not familiar, when you file a trademark it is a 12-24 month process with an opposition period. Since this affects mostly individuals, they wouldnt have a legal department to go through the publication and raise any opposition. I think Jake being granted the trademark was proper I also think there could have been opposition raised that with Jake's encouragement the mark was encouraged to be used and publicized for years and could be considered generic ant trademarkable. however, I certainly have zero legal background other than filing some trademark papers.