Some of them would be thinking that how they would do something from me if they don't know my identity?
It would really be just dumb that you would really be showing off and bragging your wins but if you aren't that really revealing any traces about your identity then I don't
really see any problems but it would be much better and safe if you don't consider on doing such thing in the first place.
doing so will put you at risk. we don't know how these scammers work. they can even search all the posts that you had and get some info that you thought would not put you at risk. so yeah, better keep it to yourself before you regret your action. scammers know how to extract info that will make you a vulnerable target.
to avoid such situation, just be happy that you got your winnings and don't play being an egocentric individual.
I doubt that it would be the scammers that you should be worried about, it is the hackers. I know that some guy I have never met before used my name before, I didn't share my real name, only thing I shared so far is just a nickname, not even which nation I live, so how he figured out my name? I am sure that he could google and find nothing, but I was still careful and then he said where I lived, not the apartment part but close enough.
So long story short, it is always dangerous and they could always end up saying something that is doxxing you and that scares people. They could also connect to your computer somehow, just make you download something, which you shouldn't obviously but they disguise it as other stuff, like literally send you an image and when you click an image you do not expect it to be key logger but it turns out, it can be.