So, to stay safe from getting physically attacked or getting on trap online, you must keep your bitcoin portfolio anonymously within yourself and stay unrevealed I'm both online and offline so that you don't get yours funds and life at stake on any selfish attacks.
Once you did kyc and tried to deposit your asset on cex then they know your asset or holdings but it doesnt mean other people will. Thats depend on someone to keep his portfolio kept and hidden from anyone that might be a threat. Unless cex got compromise and hackers able to get data of these and known users who got huge assets and plan to rob them. Well for anyone safety just keep it quietly.
Sure. The utmost fear on revealing your asset holding is the outbreak of individuals personally on their own coming to the media and physically exposing themselves that they holds bitcoins or any crypto assets.
Then the threats of physical and online attacks will be more than just when the central authorities get known of you through the enrollment of Kyc in the centralized exchanges. That doesn't really mean much to say in as much cryptocurrencies isn't prohibited in your region and you're not facing any legal monetary issues. Where fear would lie on the CEX is about hackers who may get access to the network just as recent it happened with the Bybit exchange.
The worse mode of being at stake to the lost of your funds or probably your life is the concept of telling the public your worth of crypto assets and then you walk freely in the society. Then, your life alone will become a hunting treasure where rubbers would ask for your asset as ransom so they don't get easily caught since the crypto blockchains is decentralized unlike the fiats. So you don't even need to physically hold briefcase full of $ before they come for you.
So it's all about keeping mouths shut and your portfolios unrevealing.