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Valve faces a £656 million lawsuit in the UK for 'overcharging 14 million PC gamers'
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I've read about this one. I don't know if it applies to games totally managed by other stores, but I know it originated with key distribution. The gist is, they distribute keys to the publisher free of charge, so this was so they can't undermine their pricing while still utilizing their content distribution systems.
IIRC, it basically just says that base prices have to be the same.
Yeah. If this restriction exists it’s pretty clear it only applies to selling steam keys on another platform, not for selling generally. Pretty often games are cheaper on Epic or GOG and don’t use steam for delivery.