Of course legal and illegal bitcoin depends on how to use it, if anyone says that illegal bitcoin may be caused by people using bitcoin for crime transactions. But in general bitcoin is used for business purposes because bitcoin is very useful if we have knowledge about the use of bitcoin well.
I agree with your opinion bitcoin directly make it easier for people in investing their money different opinions with people who misinterpret because do not know kegunaanya and minimal knowledge. conclusion with this market we can know the activity of world transaction through purchasing bitcoin. thanks