Deep Vision interview questions

They called me for interviews knowing that I am a pure backend engineer. They knew that I had no experience with embedded systems and deep learning but they still continued the interview process. I passed 3 technical rounds successfully in which they never asked or mentioned anything related to embedded systems or AI. In the 4rth(final) round, after inviting me to their office, they realized that I don't have the required experience. They should have thought about that before wasting my time and giving me hope. Really, a very disorganised company.