I guess making a profit by day trading Bitcoin depends on many factors, one of those factors is the level of knowledge in that field! But just knowing is not enough, you need to have good timing, you need to have good analytic skills, capital for trading is also very important (asset allocation), risk management... and I believe luck is one of the factors as well, to simply be online and in the right place in the right time!
In crypto, anything is possible, so people should try it and discover by themselves is day trading for them or not!