I'm with you for the most part, but they aren't a monopoly. The definition changes depending on who you ask, I'm going by the overwhelming market share + providing barriers to entry to competitors. They do debatably meet the market share, but I'd argue not the practices that bar the existence of competitors.

I feel like they've been very careful to not meet that second criteria and it's been healthy to the games market as a whole. GoG has a different niche, humble bundle sells wholesale discounts, and every company has their own store, for better or worse.

Meanwhile epic gets on my nerves because it's been throwing around exclusivity deals to their platform and throwing around free games, which are both tactics to try to undermine the others in the market. If they had the kind of userbase steam has, yes I'd say that would be a monopoly.