> the w3c standards define, that browsers execute the commands they receive from the server
I'm no expert in the matter, but this seems a little convoluted to me? To me, the server does not issue instructions, per se, it returns a declarative text/binary response that describes the sturcture of the website, it is then up to the browser, that the user installed and chooses to use and may configure (and possibly configure to leak their data, even if spec-adhering behaviour of rendering the webpage should not), to attempt to understand the document and retrieve any other resources that may assist displaying the content correctly.
On the other hand, if one was to send CPU instructions back to the user, I guess it's also there choice to execute them...? Also, it's not possible to determine which resources are for display purposes (fonts), and which are for tracking purposes, the browser will blindly have to retrieve the resource, so websites have a certain responsibility to issue privacy-respecting "instructions".
I'm trying to argue both sides here, I still believe that the user chooses voluntarily to use the browser, visit the webpage and therefore parse the document and initiate any subsequent requests that the document proposes, on the other hand, this is beyond most people, they just want to view a frickin' website, so perhaps the lives of web developers should be made harder to make the lives of the average Joe, who is not an IT expert, a little easier? The architecture of the web is inherently not privacy-respecting, in order to save bandwidth (and for sake of simplicity), we only send fragments and let the browser choose what else it needs, which can be tracked.
It's like walking in a park. You choose to show your face to people, we've come to just accept the fact that by the laws of nature, we cannot prevent other people from seeing our face (unless you use a mask, but then you make them very uneasy), we leak data that others can remember and use to identify us later.