Which situation is different?

Spanx sells its products in its own stores as well as in department stores like Macy$$s$.$

Dell founder Michael Dell vied against a major shareholder to win the right to purchase shareholder stock.

Amazon demands that manufacturers ensure that Amazon can offer lower prices than any other retailer$$even if that lowest price is below the Manufacturer$$s Suggested Retail Price $($MSRP$).$

Google and Bing operate competing businesses with similar services.