https://www.idquantique.com/random-number-generation/products/quantis-qrng-pcie/

Edit: the actual way they do it is from things like sensor noise, it’s practically impossible to predict the random noise on a temperature sensor for example

Edit2: oh wait it’s literally just an led and cmos sensor lol (well i guess there’s a lot of processing etc but still)

That depends on whether you believe in determinism.

Current CSPRNGs are good enough for our purposes.