Instruction Partners interview questions

They have a robot first mentality - they asked that we do a SparkHire video interview, which is a such a good indication of how they value people (they don't), and then never followed up. It's been weeks. It's not just an inequitable approach (a lot of research has been done on this) but also really disrespectful to applicants.

First round was a video interview via Spark Hire, second round was an assessment that took 3 ish hours, 3rd round was an actual interview with people via Zoom, then another 4th round interview. They asked for 4 references prior to the 4th interview and I confirmed with 3 of my references that they responded. 2 days after the 4th interview, HR reaches out to me and says they've only heard back from one reference. I ask them to double check, they say ok, and that was the last formal communication with them. Late that evening I got what looked like an automated email saying my offer letter was cancelled? I was never told there was an offer letter...I hear nothing until about 2.5 weeks later when I receive a generic rejection email. They wasted a lot of my time and all I got was a generic HR email.