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
What you have stated were the worst thing I heard regarding to the bitcoin. I also want like to add the other common terms that people likely to add in the word 'bitcoin', some of it are illegal thing, scam only, nonsense thing, and so on but little did they know that it is actually a helpful innovation to all of us. They just aren't explore ot yet so that is why they said those things.