Well a lot of critics has come out to state a lots of rumours about bitcoin and in some way caused panic well that's among the newbies.
So said bit coin is a bubble just like tulips, some says it is a ponzi scheme and will soon be banned
Other where critical about it's security level and it's vulnerability to hackers well over nine years bitcoin still is the top coin in the cryptocurrency and those critics are still trying to purchase more bitcoin
What is the worst thing you have heard about bitcoin
That "This is the grave of Bitcoin". It took place at the discount stage before and now I hear it when they look at it in the market now. There is always a lot of information around it but it still exists today. They also say it is a "giant bubble". But it has not exploded and disappeared.