You thought right, but the people affected were using a centralized financial institution called Celsius, which collected their PII and held custody of their cr

You thought right, but the people affected were using a centralized financial institution called Celsius, which collected their PII and held custody of their crypto and fiat. They leaked (actually the court) this information, not a blockchain or a specific cryptocurrency network. You cannot expect privacy with cryptocurrencies when you renounce to it voluntarily by doing this. In addition leaks of this kind when it comes to credit card numbers and other sensitive financial information are not very rare unfortunately, hopefully you express the same concern when it happens to millions of people every year.