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Valve faces a £656 million lawsuit in the UK for 'overcharging 14 million PC gamers'
(www.gamingonlinux.com)
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This is the first I've heard it that way. I haven't read the contract though, so I can't say I'm correct with confidence.
The only claim anyone has ever documented is detailed in the article.
You can read through all the claimants key documents if you like 😉
https://steamyouoweus.co.uk/updates/
So far no one has ever shown Valve asking for price parity with other outlets, and this doesn't appear to be any different. Just a lawyer looking for a payday.