Computer memory (main memory anyway) is rewritten every time it’s read …nay even more so it’s refreshed even when it’s not read

And flash drives, you probably aren’t getting a decade out of one of them without bit flips

A computer algorithm can absolutely be non deterministic, pick your language and run random.rand()

There is a whole class of such algorithms https://en.wikipedia.org/wiki/Nondeterministic_Turing_machine

But I don’t see how it makes a difference, even deterministic algorithms can produce infinite complexity, eg linear neural networks are proven to be able to compute any computable function, or the Mandelbrot set which is produced from a single recurrent statement but encodes a space of infinite complexity

Maybe your point is to say that a brain is performing a non computable function…but since your brain is computing that function…is that a counter example?

Ya looks like it, the density of toads and snakes is much higher in real life