Unity is coming out with a new pricing model for 2024, where game developers will have to fork over money every time someone installs their game. this includes redownloads of already bought games, and downloads of games from places like game pass. it also applies to game demos and free games. it even applies if someone transfers a game from one device to another.
the policy applies if your company makes over $200,000 in yearly revenue and the game has been downloaded over a certain number of times in its entire lifetime.
there are rumors that gambling games and gotcha games are exempt.
https://blog.unity.com/news/plan-pricing-and-packaging-updates
No company is going to agree to a contract that opens them up to unlimited liability based on an interaction between third parties (Unity and customers installing their game) that they can't even audit. So, obviously the way this will be implemented is the game will phone home to both Unity and the developer during install. The developer will be able to allow or disallow the install, and will gain an audit record of all "installs" being performed, prior to being charged by Unity.
TLDR: This will result in customers having to deal with games having a limited number of installs, and pirates having to overcome the phone home systems rather than developers being exposed to unlimited liability.