There are people who make a living out of it, a decent life at that, but they are not experimental traders, many of them trade across different markets-stocks,bonds,cryptos,commodity market, forex and are vast in knowledge in it
I know someone who is into crypto trading full time and seems he gains so much during the bullish amrket and is now living on his dreams. He is very lucky because he invests timely and sell during bull season. He is now out in emploument, very inspiring. Now he diversify his assets to real estate, stocks etc.