As a foreigner living in South East Asia, in my experience asking for a passport number + date of birth + trivial questions (do you have a mortgage? Do you have

As a foreigner living in South East Asia, in my experience asking for a passport number + date of birth + trivial questions (do you have a mortgage? Do you have a loan?, etc...) is used to prove your identity over the phone. The questions are easily bruteforced through so I'd say it's a real issue. I'm deeply concerned by that leak because of that. And I find it more concerning than BA leaking my financial details without my passport number (which also recently happened and led me to cancel one of my credit card)