Comment by BartjeD

Find any definition of "monopoly" and it should be pretty clear that it's not merely marketshare but the active manipulation of markets and market conditions to produce that marketshare.

    > A monopoly is a market in which one person or company is the only supplier of a particular good or service. A monopoly is characterized by a lack of economic competition to produce a particular thing, a lack of viable substitute goods, and the possibility of a high monopoly price well above the seller's marginal cost that leads to a high monopoly profit.

^ Wikipedia def is a prime example (https://en.wikipedia.org/wiki/Monopoly)