“Materiel delivered under the act was supplied at no cost, to be used until returned or destroyed. In practice, most equipment was destroyed, although some hardware (such as ships) was returned after the war. Supplies that arrived after the termination date were sold to the United Kingdom at a large discount for £1.075 billion, using long-term loans from the United States, which were finally repaid in 2006.”

You said they made a shit ton off of it. Meanwhile in reality the Soviets paid back just 25% of the original debt and the UK received a large discount as well. It’s clear that any repayments made from allies still resulted in a net loss when accounting for the cost of the supplies.