Affiliate pyramid/matrix's are not scams. As long as you have the skills to refer new people they keep paying. Although generally I prefer free to join matrix rather than paid subscription.
Sounds like you might be talking about a hyip or ponzie? Which most of the time if done professionally is a "long con" rather than straight up scam. Which means profit is possible for early adopters in some cases but certainly not all. (no i don't remember bitlords)