Вот вам выдержка из буржуйской википедии:

While repayment of the interest-free loans was required after the end of the war under the act, in practice the U.S. did not expect to be repaid by the USSR after the war. The U.S. received $2 million in reverse Lend-Lease from the USSR. This was mostly in the form of landing, servicing, and refueling of transport aircraft; some industrial machinery and rare minerals were sent to the U.S. The U.S. asked for $1.3 billion at the cessation of hostilities to settle the debt, but was only offered $170 million by the USSR. The dispute remained unresolved until 1972, when the U.S. accepted an offer from the USSR to repay $722 million linked to grain shipments from the U.S., with the remainder being written off. During the war the USSR provided an unknown number of shipments of rare minerals to the US Treasury as a form of cashless repayment of Lend-Lease. This was agreed upon before the signing of the first protocol on October 1, 1941, and extension of credit. Some of these shipments were intercepted by the Germans. In May 1942, HMS Edinburgh was sunk while carrying 4.5 tonnes of Soviet gold intended for the U.S. Treasury. This gold was salvaged in 1981 and 1986.^[83] In June 1942, SS Port Nicholson was sunk en route from Halifax, Nova Scotia to New York, allegedly with Soviet platinum, gold, and diamonds aboard; the wreck was discovered in 2008.^[84] However, none of this cargo has been salvaged, and no documentation of its treasure has been produced.^[85]

Так, с чего вы взяли, что Ленд-Лиз был бесплатным?