Robinhood interview questions

I applied to Robinhood for several positions online via their websites careers tab. Within two days I got an email from a recruiter about scheduling a phone interview with another recruiter for their office. Phone interview was super easy and the recruiter said he already wanted to move to the in person interview but there was a "written assessment". Which he summarized as no big deal and was super easy. So for the 'written assessment' they want you to write about shortcomings you find through their app or website, and correct grammar, spelling, and styling errors of this INCREDIBLY long email response. I spent about 2.5 hours completing the process, trying to provide an outside the box , unique response to their "shortcoming" prompt. Checked and double checked everything, had a friend check it for me as well. Confidently submitted knowing I portrayed product knowledge and enthusiasm for the platform. Two days later I got an email basically stating they're not moving on with me and couldn't tell me why "per company rules".. because feedback matters you know. Ironically I was interviewing for a major downgrade to my current role and knew it, but was willing to hear out the company during the next interview steps with regards to growth potential and verticality. More Ironically, that never happened as I'm left scratching my head wondering how all that effort and time into a basic help desk position was rejected. Completely baffled with no constructive criticism or insight as to why they stopped the process.