Businesses are there to make money for their shareholders. If the best way of doing that is to become a monopoly and squeeze customers, then that's what they'll do.

I'm not sure what the author is complaining about. Why wouldn't Stripe expand into every available niche it can reach and "nibble" customers for every cent it can?

What kind of board meeting would that be: "we've identified an opportunity here, but we've decided not to pursue it because that would be mean, or something"