The legal system on a worldwide basis is not catching up with this snake oil issue audiophiles have been suffering for years
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Could it be mostly because nobody finds out ? High quality audio reproduction is a hobby where it’s members are very scattered around. As a personal experience I’ve never stretched hands with another individual with the same interest or involvement as I have, pretty much all interaction is trough this worldwide forums.
This kind of practices should be regulated, It should not be possible to come up with plain false claims of your product, why the same thing on different markets is considered fraud ? Remember Volkswagen Dieselgate ?
Your goal will unfortunately encounter a number of obstacles. First of all there's no unitary ("the") worldwide legal system. Even international law (e.g., a treaty concerning fraudulence in hifi) is implemented and enforced slightly differently in each country/region.
Second, audiophile snakeoil only really engages consumer protection regulation. And, in the US, the FTC is too busy suing Google. The modern regulatory state--the bane of free enterprise and no-holds-barred bleeding edge innovation--is a true marvel of all consuming bureaucracy. FAA, FCC, FDA, EPA, SEC, NHTSA... the mind reels at the myriad regulatory regimes intersecting into unknown numbers of hurdles and hoops to be jumped over and through in order to bring a product to market. Yet audio cables manage to largely avoid all of this regulation. Why?
Cuz audio cables aren't important. It's not falling out of the sky, or emitting EM radiation, or poisoning people, or harming the environment, or defrauding investors, or carrying a family of 5 at 80 mph. Or being a giant monopoly that potentially shapes and affects every single person's life. No, they're toys. For adults. Real toys for kids are more highly regulated.
Ultimately, lawmakers can only regulate so much because their constituents (i.e., corporations) won't tolerate over-regulation. We already live in a world full of regulation (it doesn't matter where you live, if you're on the internet, you're in a regulatory state)--there's really no need to make more rules about the unimportant stuff.