[JLuterek]

Building a platform or building an ecommerce business? For a platform I would say the number of variations and edge cases from one business to the next. eCommerce looks deceptively simple, some category pages, product pages, cart & checkout, but once you get into the weeds with multiple brands you realize how immense the requirement list is and how flexible the solution needs to be. So it ends up requiring a large team with extensive experience to build something worth purchasing, which means it's a massive expense before signing a first customer. Most run out of funding before becoming profitable.