My understanding is that Watson basically acts as a cloud machine learning platform and people can build on it as they see fit. In that sense, Watson is basical

My understanding is that Watson basically acts as a cloud machine learning platform and people can build on it as they see fit. In that sense, Watson is basically the "brand" of IBM's machine learning offerings, no matter how singular the advertising makes it sound (i.e. the ads make it sound like a singular AI platform). Can you explain what differentiates it from Amazon Machine Learning, Microsoft Azure Machine Learning, etc?