Sheldon Creed's grandfather owns a massive construction company and funds his career. Noah Gragson has sponsors but they don't cover the cost of the full season so he's on a hybrid deal where his family pays the remainder. Just Haley, another family money. Daniel Hemric doesn't actually make money, he talked about that this year. He practically drove for free to get the Poppy Bank and JGR deal together. Zane Smith has financial backers that he owes money to. He doesn't get paid, and again he has talked about this, where people pay for his ride and then he is literally in debt to them and has to win to get out of the hole but he's betting in himself.
I know you're gonna whine and want me to cite everything out like an encyclopedia which I am not doing. Again, leave your head in the sand and don't believe it, I don't care. Almost literally every single seat below Cup is not paying a salary to the driver the way Cup drivers make a living. Trucks especially is still "broke racing", and that's Kenny Schrader's quote, not mine. Every seat is for sale.