Why don't CEOs, their children or their wives and family members get abducted as often then?
To abduct a CEO sounds more of a movie plot these days. Whereas abductions of crypto executives have become seemingly common.

Criminals seem to have gotten wind of the irreversible nature of crypto transactions. Because even if a cash ransom wouldn't be reversible in a centralized manner, cash can still be "tainted" with advanced procedures such as micro particles in manners that the naked eye can never know.

Whereas crypto can be "washed" by virtue of just being deposited to an exchange that doesn't follow OFAC. And we know this keeps happening on the daily when in many countries exchanges have workers cooperating with the police on the daily just to block addresses and investigate accounts. I've seen so many ads hiring for Binance's KYC positions these days. I suppose it most have been kind of an unspoken prerequisite for EU feds to not completely shut them down.

I don't think there's any real preventative measure here. Sometimes complete secrecy isn't an option. Like if you own a company your name is going to be on some paper trail. Maybe even if it's just a private company some government worker could leak your information from private fillings. The only effective op-sec I can think of would be to seperate yourself from society in the same manner the ultra-rich do.

Live in discreet remote locations. Travel via private means only. Go to private schools, have your kids study abroad under aliases etc.
But the think with entrepreneurship also is that one may spend many years in a stage where they aren't anywhere near rich and able to afford such amenities.