I don’t see how you could argue they’re a monopoly compared to retailers. They’re the #2 retailer, and smaller than #3 and #4 combined:

https://www.retail-insight-network.com/features/top-retail-c...

Also, most stores on that list have store brands to compete with many products, and specifically Ruffles.

#1 on the list is famous for pushing suppliers around because they know they can put suppliers out of business by cancelling contracts.

In fact, they established a 3% “fine” on any goods delivered late due to Covid:

https://progressivegrocer.com/walmart-pressures-suppliers-de...