Financial scams vary in surface detail but share a small set of tells. Guaranteed high returns — return and risk are linked, so any guarantee of high returns with no risk is either a lie or a crime. Urgency — 'this closes tonight' exists to prevent you from thinking or consulting anyone. Secrecy or exclusivity — 'don't tell anyone, this is only for select people' isolates you from the outside check that would kill the deal. Complexity you can't explain back — if you can't describe how the money is made in one sentence, you don't know whether it's real.
The deepest tell is structural: legitimate investments don't need to recruit you. They also don't pay existing investors from new investors' money, which is the definition of a Ponzi scheme — a structure that mathematically requires infinite growth and therefore always collapses. When you feel the pressure to decide right now, that feeling isn't opportunity. It's the product.