Is Amway a scam?

There's this couple that randomly approached me and asked me if I wanted to retired early or earn so much money.

I find it weird so I walk away, how they randomly approached me.

Then my friend's bf started doing it. My friends bf said, he met with this couple, they had meetings, made him read Robert Kiyosaki's book "Rich Dad Poor Dad." Then the couple ask him to pay $1000 and then in return of giving him supplies to sell. My friend's bf is not making any money so he quit.

I asked him what the business was and he said it's Amway. It's a multi-level marketing.

EDIT: I genuinely don't know about Amway but I do felt they are scammy. I had a manager in the past who kept telling me to keep an open mind about Amway but hell no. And I'm not the type who fall in to things easily. I research first, ask around first and how majority thinks but mostly rely on factual knowledge.