@BSarmady FAB support has already answered here on the forum that if you previously purchased a license, whether on the UE marketplace or on fab, and you began to earn more than $ 100k, then you do not need to buy anything again. No one obliges you to re-purchase the product.
P.S. The purchased goods on the UE marketplace are sold under the license of the UE marketplace, where there has not yet been a division by earnings. If the product was purchased before FAB, then you definitely do not need to buy it again.