Sure, but they effectively had one - 99% is pretty close and customers don't have a lot of real choice in such a scenario. Allegedly this investigation is about

Sure, but they effectively had one - 99% is pretty close and customers don't have a lot of real choice in such a scenario. Allegedly this investigation is about Azure, which isn't even the market leader let alone a monopoly. There is a big difference between having 99% of the market, and having 20% of the market.