The beauty of print-on-demand is that most platforms allow you to start for free, enabling you to upload the same design across various stores. You do not have to limit yourself to just one platform like Redbubble, Amazon Merch, Teespring, Zazzle, etc. you can explore multiple avenues. However, the main question is is it actually a free business model? Can you actually make money selling print on demand products without having to spend any money. Just because you can start for free, does it also mean you will make money without spending money?