> "Monopoly power" is not a monopoly

Fortunately, "monopoly" isn't the thing that the law cares about.

Everything to do with anti-trust law, and competition laws, is not about monopolies, and is instead about monopoly power.

> so maybe we shouldn't compare terminology across countries

Feel free to look at the the FTC says about this topic then. It to applies to companies with monopoly power, and not literal monopolies.

https://www.ftc.gov/advice-guidance/competition-guidance/gui...

"Courts do not require a literal monopoly before applying rules for single firm conduct; that term is used as shorthand for a firm with significant and durable market power"

That’s because competition/antitrust law, be it UK, EU or US, doesn’t care about whether an entity is a “monopoly” or not. It cares about whether a company is engaging in anticompetitive practices or not. The market share is a red herring.

"...maybe we shouldn't compare terminology across countries."

That sounds like cromulent use of HN.