I tried runway and pika but found the workflow not very satisfying and the results poor, too many videos are unusable.
It is much easier to do normal videos.
I will look at them again end of the year or maybe next year.
Perhaps when sora comes out, it will have a level of competency to be usable for stock.
There is so much that can go wrong and you cannot selectively edit a region or problem. The clip either works or it doesn't. I mean ai still has huge problems with image creation, especially hands, mouth, faces...I don't see how ai video can be ready soon.