Expand the argument to the economy as a whole, and it's just the Prisoner's Dilemma. You'll get screwed by someone else someday, the solar company will screw so

Expand the argument to the economy as a whole, and it's just the Prisoner's Dilemma. You'll get screwed by someone else someday, the solar company will screw someone other than you etc. I'll certainly agree it would be better if everyone cooperated. Whether it's unethical depends on your ethical framework.