Microsoft Senior Software Developer interview questions

Overall, there are four rounds: DSA, low-level design, high-level design, and hiring manager. HR contacts you solely when the interview is scheduled, and then there is no further communication. I went through the interview procedure for the fourth time, with various teams. They had three technical rounds and later HR ghosted me. After several days of follow-up emails or phone conversations, I learned that they had closed the position due to position put on hold or had hired someone internally. When asked for interview feedback, HR will respond it is mixed. How come for all the interviews the feedback can be mixed? No concrete feedback was provided. This pattern was consistent across all four teams interviews. I highly distrust the recruiting procedure. Are Microsoft HRs actually hiring, or are they wasting candidates' time and effort? However, interviewers were good people, supportive in the process and questions were of medium category. I've lost interest in Microsoft just because of HRs hiring strategy.