Japanese-language resources educating about bitcoin scam methods?

Hello, my girlfriend (who is Japanese) recently told me that a man her mother (who lives in Japan) knows, allegedly a “CEO of a digital currency company” (called “GMG”) tried to recruit her mother to become part of a digital currency operation and that she has to recruit people she knows to also join the operation and that this is a “fast and easy way to make a lot of money”. To me, this sounds like a classic multi-level marketing (MLM) or pyramid scheme scam and it raised a bunch of red-flags in my head. My GF agrees it’s suspicious. The problem is, I worry that her mother might fall for this scam and end-up losing a lot of money and potentially damaging her relations with others if she attempts to recruit them into the scam disguised as a legitimate affair. Are digital currency scams trending in Japan right now? Does anyone know of any educational, Japanese-language resources that are available online I can send to my GF so she can convince her mother that this is a scam? My Japanese-language skills are non-existent so I cannot explain it to her myself and my GF’s English skills are good but not at a level required for this kind of thing. So does anyone know any Japanese anti-scam (preferably about digital currency/bitcoin/MLM/pyramid scheme-based scams) resources (online articles, videos, etc.) that I can send to my GF so she can prevent her mother from being scammed? Thank you.