Big Leap interview questions

The interview process was 3 rounds and an assessment. The entire process took about a month. HR was responsive, except towards the end. They decided to close the position. They told me this one week after my final interview. I would have thought nothing of it, had they not done this to two other people within the last few months. I don't know if their openings are even real, but this struck me as highly unprofessional at best, and highly unethical at worst. Good candidates are putting forth so much effort, usually their best effort, assuming the prospective employer is doing the same and not wasting each other's time. But it's happened more than once where they 'open' a position, interview folks, and then unceremoniously close it. If you're a candidate, I advise you to avoid this company. Their hiring practices don't pass the smell test.