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1 star. Course 'The Power of Compound Interest According to Einstein', 2 hours online, €79. Bought out of curiosity, returned within 24 hours.
Curiously: 28 years after Einstein's death, in a financial newsletter from 1983, the most famous quote he never said appears for the first time: «compound interest is the eighth wonder of the world; he who understands it, earns it; he who does not, pays it». Before that it was attributed, also without proof, to Rockefeller and to Baruch. There is not a single letter, interview or speech by Einstein containing it. The Princeton archives, which hold his correspondence, do not have it.
What is actually true is not signed by him: €200 a month in an index fund with an average annual return of 7% over 40 years yields €525,000, of which €96,000 are contributions and €429,000 the compounding effect. Jakob Bernoulli already knew the formula in 1683, and the constant 'e' came out of that same calculation.
The course sells a mathematical truth (which stands on its own) using a false endorsement (Einstein). When someone needs to quote Einstein to explain an arithmetic to you, the arithmetic on its own is not selling the product.
Returned as misleading. Before signing any accumulation plan, check three things: the management fee, the TER (total cost) and the tax treatment on withdrawal. The formula is signed by Bernoulli.