it also depends on where you live
some countries are more dangerous than others.
but for real: you're the one that pays your bills,
better not to brag about big gains and live in a discrete way, definitely.
Some people in their desire to express their joy decide to brag on the Internet about their profits thinking that no one is ever going to be able to track them but that is definitely underestimating the capabilities of criminals, if the amount of money is small then probably no one is going to target you since the amount of effort needed to get to you is not worth the money they will get, but if you won big in the casino then it is better to remain silent about it or one day you could receive the awful surprise that someone stole that money from you.