How would the browser discern between legitimate 1st part cookies and illegal privacy violating ones? It's not a technical problem, it needs laws. And for GDPR

How would the browser discern between legitimate 1st part cookies and illegal privacy violating ones? It's not a technical problem, it needs laws. And for GDPR and other privacy rules, cookies aren't even a thing. The laws doesn't care about the medium you use. They apply beyond technicalities. For instance you could track IP addresses and a browser would have no way to stop you. GDPR makes it illegal without involving new crazy tech.