No B2B customer really cares what technology underpins a business. They never have, and they never will. They care about two things: does it help them save money, or does it help them make money? And does it do either of those things better than the alternatives? Many GPT wrappers do it better than raw dogging GPT, or for cheaper -- especially when factoring in cost of time -- so it's easy to see the value, albeit technology-wise it's also easy to get caught up in the simplicity; but most buyers don't get caught up in such things.