Banking institutions, law enforcement agencies, business leaders, Governments and many others call Bitcoin illegal.
But then - Why is the use of Bitcoin increasing?
It is not increasing that much, whatever you hear is mostly propaganda. Do not get fooled, at the moment what the "early adopters" try to do is to pump the coin to dump later on.
That is not possible to do without risk unless you have buyers willing to put their real money into it. Basically,
BTCubble coin needs people to 'invest' so there is always a Greater Fool buying high while they sell and tell the others to hodl.
It is not that simple. In 2014, we were having less than 1,000,000 users. And now, after 4 years that figure stands at 100,000,000. If that is not growth, then you need to explain the term "growth".