AIEnterprise interview questions

There were a total of four rounds of interviews, including HR. Moreover, they collected all my documents; however, they did not release the offer. If you do not intend to select the candidate or release an offer, why conduct so many rounds of interviews and waste their time?

First round was phone interview-basic personal details Second round was technical round - started with my projects and how did I implemented certain features in it and technical mostly about java and dsa and algorithms Third round was technical along with group discussions