Well if bitcoin was a bubble... it is exploding now...!! just couple of months back it was hitting $20k mark. In start when it was going down every body was saying its going doing because of Christmas people are pulling out money for shopping but i guess they should have returned back... but they did not 
Not only the bitcoin is falling each and every crypto is falling so it is not about the bubble.This is happening due to the countries banning bitcoins and crypto currencies.So it is better to stop spreading rumors around the people which make the condition more worse.I think this is an golden opportunity to invest on crypto currencies so everyone pick their coins and buy as soon as possible because the price may bump at any time.Cyrpto market is highly unpredicatble.