NVIDIA Software Engineer interview questions

I had 3 interviews with NVIDIA. One with a recruiter, one with a manager and one onsite. All of the interviews went well except the onsite interview, which was possibly the worst interview I've had in my life. The onsite interview consisted of 3 interviews back to back which lasted ~2-3 hours. Here are the reasons why my onsite was terrible- 1. The first interviewer didn't turn his camera on AND he was recorded the call without asking for permission. I notice the call was being recorded at the end of the meeting. He may have been from a different team since he asked a ton of questions unrelated to the role. In short, that call didn't go well and was personally a huge red flag for me. 2. The seconded interviewer didn't show up :/ So I stayed on the call for an hour in an empty room. He didn't send an email/apology, which was another red flag and just unprofessional. 3. Last interviewer was HR and was okay.