Neosocket teardown - the 2022 remix (Patreon)
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The Internet is littered with scams like these. Often originating in the past when people didn't have the Internet to check their validity.
They were usually advertised in magazines or newspapers who were also apparently unscrupulous in the adverts they allowed.
They may also have been sold through pyramid marketing schemes where the manufacturer would recruit some salesmen that would then recruit further salesmen so it spread out exponentially with each layer skimming a bit of profit.
I once attended a pyramid marketing seminar for the ecoflow fuel saver magnets and it was run in the style of a religious cult. Very interesting, but very squirmy too.