It's interesting that nobody was screaming bubble and denigrating the price of gold after it kept rising after the GFC.
https://goldprice.org/gold-price-chart.html
Gold 2016 - 2017: almost no change
BTC 2010 - 2017: ~22499899% increase
BTC 2016 - 2017: ~1700% increase
One seems a bit more bubbly than the other don't you think?