It is of course reasonable to restrict what you can do with a product you’re selling for money. There are plenty of laws and regulations that already do this. Without these kinds of laws intellectual property wouldn’t even exist - copyright was only created to benefit society by providing an incentive for people to create and invent things

It’s no different from mandating that the software can’t be malware that puts a ransom on your data, contain other people’s copyrighted content without permission, or just not work despite you claiming that it does when you sold it

And it’s not mandating that anything is structured in a particular way, just that the game works as the buyer would expect and how they achieve that is up to them