

Then it’s still the word of multiple developers publishing games on Steam reading the terms they have to sign versus… I guess random people on the internet? I suppose hard evidence will be difficult to come by because:
- The lawsuit has taken ages and who knows when or if it will conclude with information
- Developers probably don’t want to get on Valve’s bad side to prove it
- Even if a game is taken off the store, it won’t be easy to prove it was due to this
I’ve seen conversations that mention threads on the Steam developer forums on this, but I’ve not been diligent enough to save this. Though I will try if I ever come across it again. It’s unfortunately difficult to search for information with my admittedly limited motivation. (If anyone can bring evidence either way, I’d be very happy.)

Alright, since you’d rather argue than open up a search engine, let me be the one to do that.
Admittedly, there’s a lot of articles that are on the edge on whether or not the “most-favored nation” clause is a thing, since that’s what the lawsuit alleges. Though as I said, it has been confirmed by developers. Steam appears to indeed be clear about the policy around Steam keys usage and pricing on other stores, where it makes absolute sense. The thing is, otherwise, Valve is specifically avoiding putting this extra rule in writing. Here is a reddit thread where I found this document, which, if real (and I’m not sure why we should assume it is not) does confirm that Valve does this.
And also:
This reads to me as: If Valve finds out your game is priced cheaper on another store, they will approach you to “have a conversation”, after which they might decide to just pull your game from Steam’s marketing system (or maybe off the store) or low-key threaten to do so. After all, they have the final say on what gets offered and promoted on their own store. This is totally within their legal right (MFN clauses are common), but still a dick move, and disadvantages especially smaller developers (who’d like to avoid the “Steam tax”) and consumer, who could benefit from a cheaper price off-Steam.
That’s about as much effort as I’d like to put into this conversation for now. But if you’d like to continue, I ask you to put at least as much effort into this as I have.