Yeah. There is no such thing, especially and in particular with publicly traded companies. The only meaningful way to change behavior is regulation.

Beyond that, "social contracts" benefit the powerful and have a tendency to turn a blind eye to the worst off. Does the "social contract" require me to be a white, college educated male to secure worker protections? If you need a clear example of this, consider the relationship between citizens and police in the United States, and how blind the majority has been to how fundamentally broken the "social contract" around policing has been for minorities. That's what a handshake-society looks like.

Granted having both might be nice, but relying on a social contract is like relying on a benevolent dictator. It's great until it's not.