PTC interview questions

For my in person customer support interview I was asked to bring in work for my previous job for a customer support job interview which is very unusual. I was excited about the opportunity yet thought it was unusual but I later found out during the interview they were asking me how I helped improve processes at a different company in one of the details on that as the interview focused on my previous work and how they can learn from it. Once I was on to their intention as the interview was consisting of the interview were going to the whiteboard to write down how I improve processes at a different company. I think it’s unethical for PTC to use interviews to gain Knowledge about potential employees experiences at different companies. Once I showed that I was aware of their intention of just taking information from my old job they immediately stop the interview. My interview with PTC was very unethical as you should not use interviews to learn about how to improve your business.

He contacted me & then scheduled interview with manager & director.The response was positive & was selected for next round .They had again two rounds with team of 4 ppl ..the interview went very well but no one contacted me after that n I sent mails asking for the update but no response n then called the contact n he told they had selected some other candidate for the role.