that's no problem if you build a business with payments using certain altcoins. but what matters is the crypto regulations in the place where you market your product and whether people want to buy your product using the altcoin you specified. because your goal is to build a business for profit, right? and i'm not sure that sales of your product will go well with the business strategy you created by paying using certain altcoins for your product. but if your goal is just to have fun and not worry too much about profit, then you can create this product in a place where crypto is legal.