Two things can be true at once:

1. valve so far took tremendous care of the people using their product. They have outclassed afaik every other billion dollar company in the world in terms of listening to their customers and not exploiting them to hell (as others do).
2. billionaire companies are cancer. If gabe ever gives up valve (through death or whatever), we are at the mercy of a monopolist that can extract as much as they want.

My conclusion: force companies to behave like valve does now, but forever. Let them make money without exploiting people. And in case if valve: break any monopoly.

Down with shareholder value.