Yeah , I think I missed that part. My bad! But all the issues still remain since it is not easy to skim over the videos or search within the videos. Every time , any body looking for the answer they will need to watch whole video just to see if answer is relevant to what they are actually looking for. Moreover, if answer contains graph and diagrams in the video , it becomes much harder to correlate them to the rest of video content. Video can always supplement the answer but then in that case you can already attach video links to any answer in Quora or any other forum. It can be very niche product i.e. a subset of YouTube channel and subscriber model but definitely not a replacement for Quora or other similar forums.