Speaking as someone who runs a company, I'm constrained by law to act in the best interests of my shareholders, namely me.

I do this by offering the best possible service at the best possible price to my customers, thereby out-competing the competition and benefitting the company. I'm pretty sure that any other company which wants shareholders operates in a similar fashion.

It's odd that the law obliges me to act in my own best interests, as I can't think why anyone wouldn't.