Statistically without knowledge of the underlying data, yes: bit entropy.[0]
But in actuality, if you can discover, elucidate or approximate (in lossy compression) a better generator, then you can compress data far beyond simple repetitions and/or patterns.
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[ 13.0 ms ] story [ 182 ms ] threadEdit: Seems like no https://en.wikipedia.org/wiki/Kolmogorov_complexity
But in actuality, if you can discover, elucidate or approximate (in lossy compression) a better generator, then you can compress data far beyond simple repetitions and/or patterns.
0. https://en.wikipedia.org/wiki/Entropy_(information_theory)