It would have taken you as much effort to read the "shader" wiki entry [1] as it did to pendantically put down a foss library website for privacy issues. You would also have learned a fundamental concept I 3d graphics.
Are you on safari/any ios browser? If you are, I suggest using a platform that supports a modern browser. The page and shaders work fine with ublock origin and googletagmanager blocked.
For what it's worth, I can confirm that on an older version of Safari the page is completely broken, and upon opening a debugger the page is utterly infested with analytics/trackers anyway.
If a page can't even display an error message when it fails, it's broken, full-stop. The browser is just the messenger.
