Remitly interview questions

I was contacted for a phone screen about a day after submitting my application. After the phone screen, I was invited for an in-house interview. After that, I heard nothing for awhile and assumed I hadn't been selected. Then they came through and asked me to come in for a full day of in-person interviews. I was surprised and a bit skeptical, but I accepted. I spent about 7 hours on site and met with 7-8 people. Some of my interviewers were really great and engaging, while other just read questions off their computers and typed my answers in. A couple of my interviewers had just started at the company and seemed really unprepared and one of my interviewers just seemed completely disinterested and like they were about to fall asleep. At the end of the day, a recruiter met with me and told me they'd have a decision for me in 1-3 days. I never heard anything from them and was unable to get any info about my candidacy even after reaching out to recruiters multiple times. I understand they can't make an offer to everyone, but I found it very unprofessional that they ghosted me after I invested so much time into their interview process.