> Why would I expect that the website would not try to figure out who I am?
For the same reason I expect my neighbor not to kill me or steal my shit. We live in a society, with societal expectations around behaviour. I, personally, would prefer not to live in an uncivilized jungle where the only rule is "do whatever you can get away with".
“Kill me and steal my shit” is a lot different.
This is more like, I am not offended if my neighbor notices that I leave my house around the same time everyday and come home around the same time. I don’t expect my neighbor to look away when I step outside. If I put something in my yard visible from their house, I won’t get offended if they look at it.
Killing and stealing are completely different things than “paying attention to what I do when I am doing things they can see”