For the ones who might think they could run the game if it’s gonna be leaked.

If we look into scenario of an actual game's build being leaked: Microsoft will be able to prevent the game from being shared, downloaded and running on your PC.

Microsoft can deploy real-time blocklists across the global DNS networks, preventing you from resolving the IP-addresses or domains hosting the download packages and automated file-matching algorithms to delete the build files, completely neutralizing distribution on their own networks.
If they gonna update the global infrastructure to block or blackhole the domain names and ip's hosting the leaked builds, those are basically gonna be broken for the entire world.

Then if the build lands on your pc – they can extract the unique cryptographic hash signature of the leaked .exe files and developer binaries which will flag these signatures globally as malware.
Once the underlying digital certificates revoked Windows kernel will refuse to execute the code entirely, recognizing it as untrusted, unauthorized software on PC that later syncs to the internet. Even if your system is completely uncompromised & never been connected to the internet before.

Leaked builds might also rely on backend engine handshakes, server pings and specific developer APIs to function. Microsoft and Take Two can track where the build tries to "ping home".

If you maybe think that some old custom Windows 10 build with Defender & Smart Screen being permanently disabled could save you, bad news – it won't.