I did, but I'm not sure I have enough information to conclude if what was done should be illegal/allowed or not, since this is based on various sections of leak

I did, but I'm not sure I have enough information to conclude if what was done should be illegal/allowed or not, since this is based on various sections of leaked documents, but it's quite possible some bad things were involved. (One may remark that turning small investments into the many billions quickly clearly is a sign that foul play was involved, but recall that his original 10% stake in FB would be worth almost $100B today in less than 20 years. I do think he sold most of the stake long ago, though.)