Bitcoin as a store of value is only when people are holding other commodities or speculative fiat. Large caches of early bitcoin holders will likely not crash a market that creates them wealth, so if there are actual commodities that align with bitcoin, and illegal drugs are not that commodity for a multitude of reasons and even just fluctuated with the usd, so bitcoin either needs significant natural resource or "hard assets" backings of bitcoin or it'll ebb and flow with the USD because shops that accept bitcoin still have to pay to do USD conversion and the rate moves dynamically just like there is a broadcasting network for the gas prices for gas stations when the gas price per gallon fluctuates quickly based on futures markets.