I don't think I fully appreciated that HackerRank does not involve the direct participation from anyone at the hiring company. I wouldn't be on board with that, and that certainly makes more more sympathetic to the OP.
Yeah, that's what galls me about it. They even give you (the proverbial you) tests so you literally have to spend zero effort, yet you tell the interviewee to spend 90 minutes on it because it costs you nothing. If you want me to spend time on your process, at least spend that time with me. I want to learn about you as much as you want to learn about me, but you don't see me sending you a Google form with 300 questions about your company to fill out.