What are the biggest challenges to developing AI powered apps?

Hi, I'm Yulia Co-Founder of Neuralfinity - AI platform for developers. We're making AI APIs for developers, so that they can build AI apps easily. Text summarization model is already in beta version. We want to write article for our blog about challenges that developers facing while making AI apps. What's your biggest trouble: lack of budget, knowledge, time, you don't have training data etc? We will appreciate your feedback.