Bait & Switch?
I get the distinct feeling with a few of these cloud offerings that they're designed to gather leads of would-be customers who can be pitched on more expensive software and services. The Tableau Public site, for example, is loaded with demos and visualization examples that date from the 2011 launch. Is it just there as a PR checkpoint and lure to buy the real software? Does IBM Watson Analytics really have a self-sustaining business model? I could well imagine software sales teams combing over the names, titles, etc. from the more than 20,000 people who have registered for that "freemium" service. And if you look at the demos and collateral matrial around SAP Lumira Cloud, it doesn't look like a lot of money and marketing muscle was invested there. Finally, Microstrategy Cloud is a managed service; it's a different packaging of the same old software.
This is just my impression, but Adaptive Insights, Bime, Birst, GoodData, Microsoft Power BI, and Tibco Spotfire Cloud seem like services that are supported, marketed and priced to stand on their own as going businesses in the cloud. As for the free services, you get what you pay for.