>It take more than simply being the best or most successful business in a sector to be a monopoly. Being a monopoly is an active choice you make as a business by intentionally engaging in anticompetitive behaviors.
By that logic are Amazon and Whatsapp also not "monopolies"? Are they simply just the best e-commerce company and chat app respectively? What competitive behaviors are they employing against their competitors?
Amazon may be dominant in a couple markets but it is far from a monopoly in them. For online retail you have Walmart, Target, eBay, Newegg, and 100s of other well known retailers with third-party sellers trying to compete. On the data center side you have large players such as Microsoft Azure and Google GCP, and small ones like Digital Ocean, Hertzner, OVH, Vultr, and many others.
>Amazon sold products at a loss for years in order to capture market share
Selling at a loss on a cost of goods sold basis, or the entire business as a whole? I'm aware of the latter but not the former. The latter also isn't obvious "abuse", because it would include all sorts of market entrants, including eg. intel trying to enter the GPU space and making a loss because of R&D.
By that logic are Amazon and Whatsapp also not "monopolies"? Are they simply just the best e-commerce company and chat app respectively? What competitive behaviors are they employing against their competitors?