The room scan came after you clicked to start the test. So, the exam clock is ticking away while you awkwardly try to maneuver your camera around to the AI's satisfaction.
I think one of my chemistry professors had the right idea with online exams. She designed the tests in such a way that if you knew the material, you'd be ok. You had enough time to go through the problems and equations and get it all done. We were given 10 minutes extra at the end so we could take a picture of our work and upload it.
If you did not know the material or how to do the problem, you weren't going to finish all of the test. There was just no way you were going to be able to flip through all your notes, google, etc. and then still sit there are trying to work through the equations.
I knew what I was doing, but I was still using at least 80% of the time going through it and the rest for double checking everything. And you could see from the spread of scores that they approximated what you could expect in a normal classroom. She designed the problems herself, so there was no googling to find the answers.
Some professors with online courses get lazy, though. I had a summer class that consisted of a billion untimed quizzes. They were open note, so it was very whatever. However, when looking something up, I discovered all the quizzes were on quizlet. All of them. All of the answers. The professor just lifted quizzes from the text publisher, I think.
It wasn't a very well designed class, lol.