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Here’s how much Valve pays its staff — and how few people it employs
(www.theverge.com)
This is a most excellent place for technology news and articles.
It is broken in the sense that it's absolutely insane that they can take 30% and nobody can build a competing product that only takes 20%.
It is not broken in the sense that they keep doing what they are doing and developers and customers consistently choose their offer.
It's not a monopoly because they exploit their position.
It's a monopoly because nobody else is trying hard enough.
It's a monopoly because gamers go where games are, and developers go where customers are.
For the same reason Apple App Store / Play Store is a duopoly.