"2016-2017: - Linux foundation founds KSPP and works on integrating basically PaX/grsecurity into mainline - does not even ask grsecurity or PaX if they want to get paid for helping but they are flamed at and bothered with inquiries from devs - according to grsecurity most of KSPP work is copy&paste the grsecurity code without deeper understanding"

I don't follow this stuff closely, but I believe that the KSPP was started by Kees Cook because other approaches had failed: grsecurity/PaXTeam had been unwilling to cooperate to get their patches upstream for a long time, so the only way to move things forwards for everybody was to re-implement the functionality without PaXTeam.