Yes, you're right, this applies equally well to the dotcom bubble, housing markets or any other bubble. Disconnects between value and price can happen in any market, and they're very hard to recognise, though if you find yourself rationalising incredibly bad news like this as having an upside or being a buying opportunity, and dismissing falls/rises of 20% in hours as normal, or claiming that an asset is inevitably going to rise in value, you're probably in a bubble.

I can't even see a clear lower-bound on the value of bitcoin as there is with say housing (rental value) or oil (use value), though it does compare well to shares - it could easily go to zero in the long term and is likely to fluctuate wildly based on sentiment in the meantime.