I think the average person just simply doesn't care about their privacy.

First of all most people, not just the average person, simply do not grasp what privacy is exactly - especially in the US, where the view on privacy is skewed by its obsolete constitution.

I mean, just the fact that anyone would think if you personally don't mind sharing personal affairs or being public, then privacy isn't much of a concern proves the lack of understanding of that principle. It's like saying, I'm not religious so neither the lack of freedom of religion or the separation of church and state would have any impact on me.

The most important function of the human right to privacy is not the thwarting of interference with one's property or dignity, it's the maintenance of the control and power an individual has over their own self - and by extension that of a people.

A simple example: If I give you my phone number, I give away some control over myself because you now have to power to use that property however it fits you. That may mean to just keep in touch with me, to save the number in your contact list that is accessible to ChatGPT, Tiktok or some malware on your phone, or share it with someone who wants to dig up some dirt on me.

The key point is not whether any of the possibilities affect or matter to you but whether you would have any say in how that information is obtained, handled, kept, etc. The effect of the resulting consequences may appear only gradually and sometimes take years but those in control ultimately shape politics, the economy, culture, society. This is also one of the reasons why the US is run by so many monopolies and oligopolies in their respective market segments.