Can someone on a H1B visa (as a software engineer) be engaged in setting up a small business that is completely unrelated to the work that they do professionall

Can someone on a H1B visa (as a software engineer) be engaged in setting up a small business that is completely unrelated to the work that they do professionally? Eg. Selling of fine art or digital prints? Preliminary research suggests that this isn't allowed but if I am allowed to take photographs in my free time, and I am allowed to sell belongings on eBay, then it seems that by transitivity, I should be allowed to sell works that I do in my free time.