"However, I don't think we need to confer the rights of personhood to a corporation even though they don't have the same responsibilities or vulnerabilities. Similarly, it doesn't need to be the case that corporations should be able to extract value from the commons at the expense of the poor so that the privileged upper-middle class can have the cheapest possible gadgets."

Good, I agree with that.

But the issue with cheap gadgets goes both ways. Chinese factories allow people in India and other 3rd world countries to have a cheap (read: affordable) mobile phone.

Yes, they could pay more and give better conditions, the profit gains coming from economies of scale would still be there.