I don't think anyone else gets reassigned your ip address. it's pretty unique and it can be traced to your house, literally. There's still metadata collected no matter what you do to build a profile about what you like and things you are interested in. You can only add more layers of security, but nothing is actually full proof for anonymity these days unless you're really careful about every step. Practically every big corporation you can think of has leaked our info. You name it, they've all either leaked it or sold it to a 3rd party. There's a search engine called duckduckgo that claim to not collect data but how much can you actually trust? When you agree to any companies' terms of using any of their devices or services, you are pretty much giving them permission to take your info and they'll do whatever they want with it. You can do things like use a VPN, onion routing, and/or installing a completely different OS on your computer that doesn't collect anything whatsoever.. The more anonymous you are, the more restrictions you get from entering a website. It will think you are a robot or don't exist so it makes you go through some hoops just so you can enter the damn site, even caraudio.com lol. Like i said these are just layers of security someone would have to go through and even then you can still be breached. but if you have nothing to hide, then all of this would be pointless. I could totally see how someone would need to be private about medical issues or something very sensitive. People have their reasons but what I'm saying is it's becoming harder and harder to run away from this.