I thought maybe they were saying regional differences in prices were the cause of concern, but again that’s not really a basis for a lawsuit, is it?
As far as I know, regional pricing through Steam is completely controlled by the publisher/dev. It’s literally a checkbox for each region and a text field to enter an adjusted price. And Steam has made great efforts to stop regional key trading to prevent people from just buying cheaper keys from 3rd world countries and reselling them.
Literally all pricing is set by the devs and publishers. The guy you’re responding to has no idea what he’s talking about. The Steam store terms of service are public and easily available to read through. I know, I’ve done it. The only pricing requirement they have is keys sold off store can’t be significantly discounted under the store price. That’s it.