bitcoin functionally could pass between owners. but no one valued it at any $ value. it wasnt until it started costing people money to mine it and someone wanted a pizza for it that it then became a medium of exchange of value for goods and services... because guess what. someone put a value to it and another person agreed it was worth a couple pizzas for that and then the exchange for goods and services started
Not trolling or picking arguments, and I'm hardly an economist, but someone putting a value to Bitcoin doesn't make it a store of value, not automatically, does it?
From what I understand or remember, the very first exchange that sold Bitcoin (or bought it) assigned a dollar value to it based on the estimated cost to produce 1 unit (in terms of electricity consumed to mine it).
So while pizza day was the recognised exchange of goods for bitcoin, it was still a rather vague assignment of value.