Private browsing mode protects the client, it's so people with access to your browser can't see what you've been up to.
It doesn't do much in protecting you from servers that are tracking you - especially over time when there is a large number of individual pieces of information that might not reveal anything in isolation but when put together can be quite revealing.
It doesn't do much in protecting you from servers that are tracking you - especially over time when there is a large number of individual pieces of information that might not reveal anything in isolation but when put together can be quite revealing.