They can ask for the properties of the client, and the user can then make a informed decision to consent to that collection of personal information. In EU it is

They can ask for the properties of the client, and the user can then make a informed decision to consent to that collection of personal information. In EU it is similar to asking for identification credentials. Naturally this may make the process a bit cumbersome and websites that does not behave like this will gain a bit competitive advantage.