> Non-newtownian/non-classical/non-relatistic Quantum effects are truly random. That's the core axiom of what makes "quantum" mechanics not Newtonian/classical/relativistic.
Bohmian mechanics[1] (which is a model of QM) is fully deterministic, and Born rule emerges from the fact that we don't know some information. QM (equations, experiments) is fully consistent with a world, where the perceived randomness of a measurement is the exact same random, as in coin flips.
For additional properties that QM does not satisfy (because there are known counter examples) see https://en.wikipedia.org/wiki/Interpretations_of_quantum_mec...
[1]: https://en.wikipedia.org/wiki/De_Broglie–Bohm_theory