…as in, “Universal Entities controls 73% of the Gerbilator market.”
Uh, no, actually they probably don’t. IBM once had something like 70% of the market for computer hardware, software, and services. The big integrated steel companies, Bethlehem Steel and US Steel, once had a very high share of the American steel market. Sears once had a high share of the retail market. These examples could be multiplied easily and almost endlessly.
A seller into a market does not control that market, or its position in that market, absent direct violence (the Mafia and various drug cartels, for example) or heavy government intervention–and even the latter is unlikely to be reliable in the long term, as the owners of TV station licenses facing first cable competition, and later Internet competition as well, found out, and as the owners of taxicab franchises facing Uber and similar competition are now discovering.
The phrase “controls X percent,” when applied to a market, is almost always intellectually lazy, and is used far too often by writers who should know better.