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> Data might be arbitrary but it is never random. Not being random is what makes it data.

Counterexamples: crypto keys, stock price history, weather observations, radio telescope recordings

I think the point is that once it becomes a crypto key, stock price, weather observation, whatever, the datum ceases to be random and becomes arbitrary.

That is a nonsensical definition of random. If I roll a dice it's random, but if I write down the result it's not?

Arbitrary is also quite different from random. Bad passwords are arbitrary, good passwords are random.

If you ask a human to give an arbitrary number between 1 and 10, the answer will be 7 way more often than a random number between 1 and 10.

Note: weather observations being truly random data has been proved just recently (Navier-Stokes equations)

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