Is affiliate marketing a pyramid scheme?

I’ve been researching ways to make money online and affiliate marketing comes up a lot, but I’m concerned it might be similar to a pyramid scheme; what are the fundamental legal and structural differences between the two, and how can I evaluate a program to ensure it’s legitimate?

Affiliate marketing is legally a performance-based advertising model (you earn CPA/CPS revenue for a verifiable sale/lead), while a pyramid scheme/MLM-style scam pays primarily for recruitment/downlines and “buy-ins” rather than end-customer demand; when I vet offers, I look for clean T&Cs, transparent attribution (cookie/window, postback/S2S), no mandatory inventory/fees, and proof the product converts to real customers.

To evaluate legitimacy fast: confirm the merchant/network has a real product with market pricing, no “pay to join,” payouts tied to tracked conversions (not sign-ups), reputable tracking + compliance (FTC disclosures, refund policy, GDPR/CCPA), and third‑party credibility (network reputation, chargeback rates, EPC/CR benchmarks, and whether they allow independent traffic without pushing recruitment).