Re: A next step?
...a deeper drill-down into the age, gender, race, geographical location and probably many other attributes of the people who responded: either positively or negatively would be illuminating.
From the paper:
"To that end, we sampled public commentary on three online videos – depicting Bina48, Nadine, and Yangyang – available via YouTube."
It is not possible to gather that data based on comments posted to YouTube, but the study authors address this and other issues in the "Limitations & Avenues for Future Research" section of the paper which notes that it is simply meant to be the start to a broader line of research. I thought it was a well written piece of work, for what it is worth. It even includes links to the videos in case you would like to check them out yourself.