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@evan I think there’s more to it. They have outsized influence, not just presence.
Perhaps another term is more useful, then. The UK Competition Act, for example, talks about a “dominant position” in a given market.
https://www.legislation.gov.uk/ukpga/1998/41/part/I/chapter/II
@evan I also believe dictionaries are descriptive, and English can change. 
@evan I understand that. It’s why I put in my caveat of “companies approximating them”.
@evan How does it skew when you start looking at revenue and profit, though? How about amount spent on lobbying in rich countries? Influence in standards bodies such as the IETF, W3C, etc?
I don’t think monopolies and duopolies can be defined purely in terms of consumer marketshare.
@evan No, but of all the tech monopolies (or companies approximating them), they may be the least terrible.
I see an otherwise-reasonable USAian is once again pretending that GDPR enforces cookie notices because they have a profit incentive.
How boring.