Success is not illegal. Valve isn’t buying up smaller competing storefronts, or paying off developers for exclusivity, or burying competition in legal fees and prepared 80-page lawsuits. The only thing holding back real competition is the competing platforms being dogshit.
I was excited for the EGS when it was announced. Then it turned out to be a garbage platform with the shady exclusivity deals that turned Steam into an ad platform for games that had been poached by Epic. Valve responded to it with the Steam Deck and Proton.
Leveraging dominant position to keep your monopoly is illegal even in the US.
At some point you’re so entrenched in the market you don’t have to do anything anymore. I was quite surprised that Valve somehow evaded EU Digital Markets Act gatekeeper criteria.