Video AMAs are easier to sanitise. They ask for questions then give the 10 most upvoted to the guys to provide a video response. Of course the 10 most upvoted may not be easy softball questions so they can remove these and the guest never knows about them. Right now the guest knows the questions but can refuse to answer them but then it is apparent they are ignoring difficult questions. With a video AMA they get to distance themselves considerably from anything out of their comfort zone.