Bitcoin isn't a bubble it is misconception everyone has but, in reality, bitcoin have organic growth due to limited supply and high demand bitcoin growth is huge in short period of time
People who had lost money or want to buy at very low rates keep spreading this FUD generally that it is bubble etc and so that people get panic and start selling thus the price will fall and then they can enter the market and buy at low price
Indeed, they make people panic so that they can get this an opprtunity to buy. Because of mistake they have done they spreading FUD which make the situation on the market worse. Hence, us that have enough knowledge must not carried by this negative thinkers but rather spread the good news on upcoming pump.