Sometimes they do: [https://www.aopa.org/training-and-safety/online-learning/early-analysis/n129mm](https://www.aopa.org/training-and-safety/online-learning/early-analysis/n129mm)
The short answer is altitude, because with that comes time, usually. When pilot blacks out, generally they relax and whatever control input that was causing the high G loading is no longer there, so they wake up, hopefully with time to resume control and prevent bad things happening.
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