The interviewer didn't use the whiteboard app at all, I was writing queries on pen and paper. He was also typing really loudly the entire time, which basically destroyed my concentration.
The questions were not hard, but when I tried to get any feedback or clarification from him he would just repeat the question over again, and ended the interview abruptly half an hour early before I could even formulate responses...since I was writing on paper.
To be frank, it didn't seem like he was paying attention. I'm sure these guys do thousands of these, but based on the email I got from my recruiter, I was prepared to answer in-depth technical questions on database architecture, internals, and query tuning. This was...not that.