That was the result of social engineering though, not iCloud being compromised. AFAIK it was a phishing scam, asking the victims for their usernames and passwords.
This should illuminate for you that there is nothing special about iCloud privacy or security, in any sense. It has the same real weaknesses as any other service that is UIs for normal people.
> there's a difference between a person being tricked to give up their credentlials and a zero day.
Only if you work at Apple.
We have mass conversational and voice cloning technology. It's not a question of if but when.