It might be easy to demonise Bungie, but I can see both sides honestly. When new management comes into down it becomes difficult. I love Marty's passion, and band of brothers mentality, but I can also see Bungie's management perspective. They have a lot at stake, a company to run, families to feed and pay checks to cash. I know it's a romantic notion to flip the bird at the man, but that path is not always possible. Marty is an artist, passionate to the end and no doubt stood for what he believed in, artistic integrity (I salute you).. But Ryan and co also had a new paradigm to work in and their employees future to think of. It's not so black and white.
tl;dr Big money, big corporations, big problems
E: also there was no need to screw Marty over with shares and not paying, that's Activision flexing corporate muscle, probably to keep in check any fellow employees who sympathised with Marty's ideals.