Extending the metaphor, a competitor can be good for business depending upon your strategy. If you're a hyena, you benefit from having lions around because the

Extending the metaphor, a competitor can be good for business depending upon your strategy. If you're a hyena, you benefit from having lions around because the lions can kill a much larger animal than a pack of hyenas ever could. Maybe someone else on HN can advertise their copy of a product, but all that's doing is growing the target market for the OG product which already has a (small) monopoly.