Nope, at least in Play Store it's because of how Google chooses to run their store. Google is the middleman between two sides of the transaction and its the developer that actually sells these apps, while Valve is one of the sides of the transaction and sells things based on the license granted by the developer. Not sure how Apple does it though.
replyGoogle publishes seller contact and Google and Apple both do so because of how EU law was written as it pertains to how they set up their stores
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