We’re just going to NIMBY the problem onto someone else?

As is tradition.

Yeah it’s particularly weird in this case because Ubisoft and Valve both have publisher, developer, and distributor departments within each company. So the agreements they signed and put into place are probably somewhat complex.

Looking at the Steam page though it says

Developer: Ubisoft Montreal

Publisher: Ubisoft

So in this case it’s whatever Ubisoft as a publisher signed / agreed to with Valve when they accepted their distribution terms. These are probably not the same boiler plate terms an indie dev would sign if self publishing.

Yeah but it’s fairly simple.

You can generate Steam keys using the Steam developer tools. This allows a game key to be purchased on any storefront that supports selling them, which can then be activated on Steam.

The main requirement? You can’t price those steam keys on a 3rd party store cheaper than on Steam itself.

For that, it means if the 3rd party store takes a smaller cut than Steam itself would take, the developer makes a bit more profit through almost no additional effort. Steam is the system users use to download and update the game, and cloud save syncing, and community guides, forums, workshop, etc.

The developer is, afaik, more than welcome to also sell a UPlay key if they partner with Ubisoft at any price point they want (regardless of the Steam price) because Ubisoft is the taking on the burden of distribution, etc.

The only price requirement Valve imposes is on selling Steam keys on 3rd party storefronts. Not UPlay keys. Not Xbox keys. Not Epic Store keys.

Edit: and I read the article, while albeit short (can’t access the linked Bloomberg article sadly), they claim exactly that, that the version on UPlay was significantly cheaper than the version on Steam for essentially the same game. Valve was arguing that Rainbow Six Siege needs to change their pricing on UPlay or they would be delisted.

If I recall correctly compression, especially lz4, has been shown to impact performance negligably.