As a freelance developer, I am very reticent to work with someone that doesn't know enough about what I do to actually review my work. However, I think people skills are important enough that I totally agree on the reviews point.
Actually, you don't even need to run route 53, you can just make the bucket public and do a standard dns lookup from whoever you got the domain from. That said, I think there's a huge value in having a central repository and a standard way to display a developer profile.
This product is meant for a very different user base than a library like sklearn. In fact, much of our functionality leverages projects like sklearn, skimage, etc...
Basically what we're trying to do is extend a series of pre-trained models on common problems that don't require any training data from the user.
The drawback of this is that these api endpoints are less flexible than a true library, but the plus is that the user never has to deal with encoding features, or even finding, let alone cleaning raw data sets.
Sounds like word2vec.