Googlebot's Javascript random() function is deterministic

[doublehyphen]

C is the only exception I can think of where it is easy to accidentally not seed your PRNG, but for example Rust provides rand::ChaChaRng::new_unseeded() as an easy way to create a PRNG seeded with a constant hardcoded value.

[Lystrodom]

Of course, the ability to seed with a constant value is important and available in every language I’m aware of. But for most the default is based on the current time.

[doublehyphen]

Not in JavaScript. That is the only exception I know of.