Baselessly defending Steam I see.
They control over 70% of the Market which is considered a monopoly even in the more stringent federal courts.
False.
Oh God another Steam key propagandist. The Steam Key thing was debunked years ago and not what anyone is currently talking about. Steam is on record in court lying on the stand about this. If it is "industry standard" why lie? Simply put, they know they engage in price fixing and parity to control the market.
It is clear you have not studied this.
https://www.rainintelligence.com/blog/price-parity-mfn-clause-antitrust