Hey Rocket interview questions

Applied through JobStreet. Position closed. Then suddenly WhatsApp me if I am still keen. Filled up my form and was ask to attend interview. Went down for interview to realise is a mass interview including walk-in jobseekers. Followed through the interview process for a simple position as I am not looking for something complex. Didn’t mind the shift, didn’t mind the lower salary. Was told to wait for 2 weeks like the rest of the mass interviewees. Around 1 week time told me not selected for this simple role. Wasted my annual leave thinking is a normal small group or individual interview else would have rejected before going down. Over qualified? Or just to satisfy their KPI as this is a recruitment agency. Would not go through agency again. Chances of selected is lower than direct applications to the company