Not at all. Investors do this all the time to gain an edge over each other. It's ethical because they're actually providing a service by moving the stock price

Not at all. Investors do this all the time to gain an edge over each other. It's ethical because they're actually providing a service by moving the stock price towards a more fair value so subsequent investors don't get ripped off. Some investors will lose money but those are the ones that didn't bother to do useful work investigating the company.