A "free" visa is an illegal visa. It will end up costing you untold amounts of money and misery. You are, in essence, selling yourself into slavery with your visa provider able to blackmail you at any time and have you deported on a whim. You give up all legal rights when you purchase an illegal visa. Don't do it. And especially if you do, don't come on QL and whine that Qatar practices slavery and ask where you can go for help.