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72% of devs believe Steam has a monopoly on PC games, according to study
(www.gamesindustry.biz)
Steam is a video game digital distribution service by Valve.
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Even if there were literally no other competitors, GOG holding 1/6th of the market share (your words) absolutely precludes Steam from being a monopoly.
You're using a different definition of monopoly from what I'm using. To quote Wikipedia:
I'm using the latter of those definitions. I don't think it's particularly useful to only consider it a monopoly when there are literally no competitors. I think it is useful to consider it a monopoly when it has dominant market power. Steam's estimated 75-80% market share is dominant market power.
So how often does steam charge overly high prices, which is associated with unfair price raises?
One doesn't have to actually use a power in order to have that power. If I was carrying a loaded shotgun, I would have firepower. I wouldn't have to actually fire the gun to have firepower.
Also, one could argue (and Epic Games has) that Steam's 30% cut is overly high for digital distribution. I'm not sure whether that's true or not, but that doesn't really matter to the question of whether Steam has dominant market power.