This is really interesting if these stats are true. Just to comment on the raising child as different gender, I personally would put this down to wider societal influence as the parents of course dont have full control of what their child is exposed to - they can only control so much. This could be things like bullying, advertisements, minor subtleties present in society (such as the signs used on gendered toilets) and probably others. But just want to be clear that i dont think your conclusion is invalid by any means, just wanted to give my viewpoint on that specific stat in case you hadn't considered it already and maybe we can learn from each other :)
The identical twin study specifically sounds really interesting and I'd love to read about it if you get the time to link it, thanks!
Ok I just went down a very deep internet rabbit hole and went from believing google definitely sells data to it doesn't sell data to it sells data (kinda). I'd recommend this article on RTB's which explains how google advertisements actually work and how they leak your data (including your location).
I'd also recommend watching the short video by Brave linked in the article - I didn't understand the first part but the actual article explains it quite well, the end is the juicy part.
Hope this helps!