I am talking about both legality and morality, but they both refer to different aspects of all of this. For my case, I go by morality, but that doesn't mean certain aspects are necessarily illegal either. Selling info to a third party isn't a necessary part of the equation and not a part of what I was saying when I implied "as long as it's not deceptive".
When you use a website, they have the option to turn it into an agreement. If this is employed in such a way that it follows how agreements should work, none of this would be an issue. That isn't random. Have you never heard the adage "property is nine tenths of the law"?