What's the development cycle of a major game? If someone worked on multiple games from start to finish for a studio, how many games would they have completed in a ten year span? Do game studios allow developers to talk about anything and eveyrthing they're working on in public or do they have them work under non-disclosure agreements?

Who cares about any of that? He was being paid. It was not a charity, it was work.

Companies don't owe you anything. (And you don't owe them anything, either.)

Work is a temporary agreement to provide services in exchange for money. That's it. Understand how the world works.