Sudden wealth syndrome can be controlled, the first step to doing that is to maintain privacy, there's a level you will get to and win a huge amount of money and then you try to avoid going public with it, the second thing to consider is in the clique we move with, we have to be very careful of friends i gambling, they can lead us astray if we are not careful in whatever thing we are doing while gambling, some people have achieved nothing over years and don't mind you loosing together with them all you had, since they have nothing to miss at the cause, lastly, every opportunity in winning a huge amount of money should be invested and not a time to begin irrelevant celebration to lavish the money with friends, drinks and women.
Keeping the winnings secret can't lessen the SWS IMO, the best move I think is to seek out financial advisors. Since we are not familiar in financial management, it is not bad to look for advice on things we are not familiar with. We don't have to expose that we won a huge amount of money, since we have the right to keep our financial status secret, but getting advises, and knowledge about financial literacy often saves us on this kind of syndrome by knowing what to do next.
I also agree that we should not live our lives in a luxurious life, boasting about our financial capability, it is always best to have a low profile, this will save us from lots of dangers and headaches.
Making a habit to buy luxury brands and other luxury things that aren't really needed is just a plain symptom of SWS and yes, you're just getting yourself in a dangerous situation as you will be targeted by someone who wanted something from you. I know that they deserve to buy things on their own preference because they now have the power to buy things on their own accord because they are already wealthy, but these things can wait because they don't have any knowledge yet how to maintain their status.
Hiring a financial advisor would be the best and safest move while you yourself is learning on the sidelines how to handle things because these hiring these types of people is not cheap that is why you should be on your best version to get things in control.
Those luxury brand items I think will still be helpful to him when one day he gets bankrupt. High-value watches are still easy to sell while there are lots of Kevin O'Leary-like people in this world. Guns, jewelry, or branded watches are probably one of the pieces of advice that a financial advisor will give.
Still, these are things that can get attention from friends or neighbors who are watching closely. When you suddenly get rich, it's those people close to you that you need to watch out for.