When you have privacy settings, what you really have is a lie.
It starts out with good intentions, like those in this post, but eventually everyone forgets that the platform still sees your posts and does not give a shit about selling them.
I would rather acknowledge from the very beginning that this entire system is not private, so there is never such a misunderstanding.
Everyone should post and comment with caution, just like you use caution with what you say in public places.