It might hurt people's feeling, but most of those are not professional musicians.
I don't think it is judgemental to say that to claim oneself as professional, one need to demonstrate that they could make a living out of it. Otherwise, it is no different than a hobbyist, albeit much more time is dumped on it.
In case of streaming, now more people can declare themselves as musicians, since the barrier of publishing has been significantly lowered comparing to physical CDs. But that doesn't mean profit would follow.
To produce hit music isn't easy, and luck is certainly a factor of it.