When you don't keep things to yourself then those aren't private because anyone who's not you is not safe for keeping your passwords secret. We all know that all of us are humans, and if we trust someone else with your passwords and in this case with our wallet seed phrase and private keys then we are doing injustice to ourselves. As long as someone himself/herself keeps the passwords, seed phrases, and private keys in his/her own mind and control then nothing can harm those, and that's actual meaning of privacy.