Store of value == be able to bury it in a grave for 5000 years and be sure that it will have kept its value when someone finds it. I am almost certain that bitcoin wouldn’t survive societal collapse.
You can imagine someone burying at the beginning on iron age (which happened less than 5000 years ago) big chunk of this wondrous, rare and hard to work with material. And today we are making insanely huge buildings out of it.