Candle-Lite interview questions

Was contacted through LinkedIn and had a Standard HR Phone Interview. Then moved on to a video interview with the hiring manager and then a video interview with their manager. Questions were all pretty standard but interviewers came off as uninterested and slightly unprofessional. After that they completely ghosted me. Didn't have the courtesy to tell me I didn't move forward or anything after investing my time and completing 3 interviews with them.