Lol that's not how GST works. The GST refund system is for procurement of materials which are then re-sold so that GST is not paid twice for the same materials.
For example, if A sells wood and B sells furniture, then when B buys wood from A, he will pay GST on the purchase. Then when a customer buys the furniture, they will again pay GST. So, B can ask the govt to refund the GST that he paid when buys wood from A. Ultimately, only the end customer pays GST of the finished product. Its not that you can evade GST, if you are not paying, then someone else has to pay it.