What harm does public data have to you? Couldn’t one just ignore the ads? You can’t see anyone watching you, is public data good for public records? (I’m just curious). I know this sounds weird but is public data good for historical preservation and knowledge increasing the importance of the individual? And does public data lead to better products?
Every comment here is missing a crucial point. The data is used to identify what kind of person you are and then manipulate you based on that. It’s not just to target specific ads to you. It is to control how you behave in any way that will profit them. An example of what has been done is to identify democrats that were unlikely to be convinced to switch to republican, so instead they targeted them with content that would get them to not vote at all.