MGS made Konami a lot of money. Kojima also worked on the FOX engine between MGS4 and MGSV.
It just seems like Konami wanted to dial down on their gaming division which went against Kojima's extravagence of stuffing his game with minor details and hype cycles spanning years.
MGSV didn't need all that extra fluff like licensed songs or cake scenes for your birthday.
Konami didn't need to blackball their former employees and put them under ridiculous NDAs.
They're an awful gambling company and I'm very glad they're about to produce the biggest bomb of 2018.