Apparently people did this with the DirectX "3D Tunnel" demo as well[1] back over 20 years ago.

Also there was one "that checked if you were printing a specific string used by a popular benchmark program. If so, then it only drew the string a quarter of the time and merely returned without doing anything the other three quarters of the time".

[1]: https://devblogs.microsoft.com/oldnewthing/20040305-00/?p=40...