Bloomberg Software Developer interview questions

Applied Online. They emailed me after 2 weeks to schedule a technical screening. Screening was scheduled after another 2 weeks. On the 3rd day after screening I got an email stating they want to invite me for an onsite interview. I emailed my dates to confirm my onsite interview. Due to some reason they asked me to schedule it later and finally scheduled it after 4 weeks. Interview was good. It starts with a tour of Bloomberg tower. Then they let me collect your food and reimbursement (if any). At that place 3 interviewers are waiting for me holding my resume. Then we walked to the room. They asked me technical questions based on data structure and complexity. Then another interviewer came after the current left. He asked me a design question. Then he guided me to the exit. I didn't had any HR of Manager interview. At that point I was confused as interview went well I answered most of their questions. I asked if I'll have any other interview or not. He said no they'll let me know about it later on. As per glassdoor reviews I knew I was rejected but as per last interviewer's answer I thought I still have a chance. They emailed me 3 days after about rejection. I asked for feedback but I never received any. But they emailed me the link to provide feedback about interview process which I did. The surprising part was I met few other interviewee at the exit point. They've been told the same. Common thing about all of us was we were international students. I'm not sure does that mean something which I predict or not? If so then why they had wasted my 2 months because at the time of applying I mentioned about it . That was disappointing.