Someone told me not long ago: Bitcoin is a dangerous game. It is even possible for some people or groups to take over the blockchain through a majority and destroy the entire mechanism. People don't know they are playing these games.
That's a bad impression and people have it on Bitcoin because they are not well informed on what and how Bitcoin works, they thought it's to technical when it's really not, another thing is so many Ponzi scheme are using Bitcoin and people have a bad impression of Bitcoin because of these Ponzi scheme, we should continue educating people on the importance of Bitcoin and Cryptocurrency in an evolving technology.