bubbles exist and are part of bitcoin, the 2013 ATH, the 2017 ATH, the previous ones at $20, and $10 were also bubbles. on the way up we will continue seeing the same action be repeated too. it doesn't have to be a bad thing and it is not all there is.
they also exist in all the markets. you just have to try and analyze how much of the price is a bubble. for example for bitcoin at last ATH i would say 50% of it was a bubble and needed to burst, for most altcoins i say 95% of it is a bubble which has not yet busted.
Actually there are still many people who misinterpret the bitcoin bubble, as you know that the bubble when it erupts will disappear but it doesn't happen to bitcoin, even bitcoin still exists and can even make bigger bubbles.
Bitcoin increases and decreases are certainly influenced by supply and demand, when supply is high and demand is low, the price of bitcoin will decline and vice versa, so don't misinterpret bubbles.