I believe privacy matters and it's risk if you let other people know that you are from Bitcoin forum and appear on the leaderboard. If you leak it at BetFury, you can leak it somewhere else because a careless practice can result in a careless habit that surely not good at all.

Perhaps people who have too big capital but are ready to use it for betting like $1M or $50M are pepole who care more about privacy. If I have $1M or $50M, and use it for bets, I would like to hide my true identity as most as possible. It's not necessarily by reasons related to governments but it can be reasons related to physical attacks and your safety.

Flexing it and revealing your true identity will put your life safety at higher risk of many kinds of physical attack.
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It's worth noting that Betfury has a VIP club channel on Telegram with more than 7k subscribers. So, some of these subscribers (probably users with VIP status) sometimes leave comments under posts, thus revealing their tg accounts and making themselves vulnerable to scammers.
Overall, though, I agree that security and anonymity are very important in the crypto industry, especially for those who already have a lot of capital. Unfortunately, the reality of current times is that cryptocurrency often becomes a trigger for such inadequate scammers and bandits who are ready not only to steal assets but also to kidnap a person because of it.