Prelim Marketing Associate interview questions

The interview process consists of one initial screening, three technical interviews, and a final interview with HR. The process went super quickly; I received updates within the same day or the next day. I was rejected after the third technical interview with no feedback at all and was ghosted after asking for feedback. I was interviewed by different staff, none of whom are in the marketing department. I had spent hours prepping for the 3 technicals including a pitch, a presentation, and designing a poster live during the interview, Having gone through all of the preparation and interviews, it's truly disappointing to receive nothing but a generic rejection. It seems that they don't value their candidates' time and effort at all and was truly a process I would 10/10 not want to go through again.