I don't think this is quite true. Companies which are privately owned, or run by their founders tend to have long term interests. People get tied up in the idea

I don't think this is quite true. Companies which are privately owned, or run by their founders tend to have long term interests. People get tied up in the idea of their 'legacy', or move beyond the ideals of mere profit and want to affect change in the world and build a world more to their liking. It's things like that which motivated Henry Ford to pay his workers are more fair wage than his competitors. Google's founders still control either the majority or a large plurality of the voting stock, so they can have the company align with long-term profit motives, and sustainable existence.