1. This API is convenient since it already exists and you don't have to find all of the clips yourself.

2. This API will likely be used by websites / bots hosted in some data center and not on your local machine. Also it would be possible to cache the video / audio locally.

3. I agree that as just an API it's not really something that can go viral. Something built on top of it could be. I also agree that it would be hard to generate income since most users probably only want to use it for a short amount of time as a joke. I think it is intended to just be a fun API that others can use.