In the UK if there is an advert that you think is false, misleading, offensive etc. you can complain the the ASA, who investigate it, ask for evidence from the company in question and then make a ruling. As you can see someone didn't believe that "magic internet cables" improve sound quality and took Chord to task over this claim...
"Tuned ARAY cables appear to dramatically reduce noise levels within the systems they are used in. The result of this is music with extraordinary levels of detail, dynamics and coherence ... because of the way Tuned ARAY works; connecting a Tuned ARAY cable to the streaming device will have a dramatic effect ... Music is simply so much more coherent and involving. This can transform the sound of both WAV and FLAC files and the results with high resolution downloads are simply stunning".
https://www.asa.org.uk/rulings/the-chord-company-ltd-a14-274211.html#.VLaZ1UyCOrU
The ASA don't always find against these companies those as in the case of Russ Andrews and his noise reducing mains cables...
https://www.asa.org.uk/rulings/russ-andrews-accessories-ltd-a13-228690.html
Perhaps more of us should do this for snake oil cable marketing?
"Tuned ARAY cables appear to dramatically reduce noise levels within the systems they are used in. The result of this is music with extraordinary levels of detail, dynamics and coherence ... because of the way Tuned ARAY works; connecting a Tuned ARAY cable to the streaming device will have a dramatic effect ... Music is simply so much more coherent and involving. This can transform the sound of both WAV and FLAC files and the results with high resolution downloads are simply stunning".
https://www.asa.org.uk/rulings/the-chord-company-ltd-a14-274211.html#.VLaZ1UyCOrU
The ASA don't always find against these companies those as in the case of Russ Andrews and his noise reducing mains cables...
https://www.asa.org.uk/rulings/russ-andrews-accessories-ltd-a13-228690.html
Perhaps more of us should do this for snake oil cable marketing?