... of fucking course there's a marketshare, for the sales of games on the PC market. Most sales are through Steam. Be serious.

The only games that don't live or die by being on Steam are wildly exceptional cases that would have succeeded even if you still had to drive to a store to get them.

In a legal context, the term monopoly is also used to describe a variety of market conditions that are not monopolies in the truest sense. [...] In essence, the term monopoly may be used any time that a market for a good is controlled by a limited number of actors.