That last example postdates Bitcoin, and even Bitcoin entering public consciousness (in 2011), so why bring it up ?

Bitcoin was not much in the public consciousness by then. It was trading at ~$10, mainly on MTGOX. It's likely its transaction volume was much lower than other non-crypto digital assets (and MTG cards) at the time.

2011 is when it had its first big public boom - and bust, accompanied by even generalist press reporting on it.

And the nerds at Valve would have been *in particular* aware of it. So causality is more likely to be reversed in that example.