Correct me if I'm wrong, but this is just a frame-by-frame labeling. You can download whatever pre-trained CNN, pass individual frames through it and get the same result.
True. But then you have to deploy and maintain that CNN yourself. The value prop is similar to, say, Twilio. Though, arguably, it's easier to run your own pre-trained CNN than it is to replicate the telephony, VoIP, and video conferencing stuff Twilio provides. Also, presumably Google is hoping that they can continue to train and improve their CNN so that it's always just a little better than the best free-to-downloa…
Yes, but I mean if you analyze video as individual frames, you can't declare "we do video analysis", because video is completely different domain.
There're papers like [1] where CNN output is used as input for RNN, which performs deeper context analysis. Results aren't exciting, though.