Rengen Labs interview questions

I first had a video call with the principal which lasted thirty minutes. Next, I had a video call with the CTO which lasted an hour. Note that the CTO was in a different country and time zone. At the end of the call, I was informed that they would have to interview more candidates before they can come to a decision. I felt like they were just fishing, that I wasted my time. A week passed by. I was ghosted. In retrospect, before interviewing, I could have asked for assurances that I will receive timely feedback, and not interviewed otherwise. Their tech stack includes Python 3.10, SQLAlchemy, AWS RDS, AWS EKS.