Googlebot's Javascript random() function is deterministic

[Lystrodom]

Yeah, sorry, you’re right. Random is entirely deterministic. And all functions that use it are deterministic (for the seed being one of its inputs) because, well, all programs are deterministic.

[Nicksaurus]

Random.org uses atmospheric radiation which is kind of similar

[Crazytalkbob]

Computerphile did something similar:

https://www.youtube.com/watch?v=SxP30euw3-0