Earlier quoted context omitted.
Did you to read the article which mentions all the competitors that are available?
The simple existence of competitors in a market segment is not proof that there is no monopoly. We wouldn't say for example that there are realistic copetitors in the web search space or in the desktop OS space - maps is similar to both of these sitations. (Now I realise that some people like to argue the toss about whether search and desktop OS are monopolies and to that I have no comment)
"However, from a regulatory view, monopoly power exists when a single firm controls 25% or more of a particular market. For example, De Beers is known to have a monopoly in the diamond industry."
https://www.intelligenteconomist.com/monopoly-market-structu...