How good is this MarketAmerica/Shop.com stuff?

A friend is trying to get me into this. It’s a lot to explain but I was wondering if any critics are already knowledgeable on here about this kind of online shopping/marketing thing. He gave me all these links and apparently Bill Gates is investing in shop.com. He posts pics on Facebook all the time of these huge conferences he goes to. It seems legit but at the same time I’m wary. I don’t have the time to go in too deep but the basic cashback thing sounds interesting, and yet too good to be true. I’m looking up youtube videos and seeing that some people call it a “pyramid scheme” while those who are in it see it as “multi-level marketing”.