The BlueMix web GUI (bluemix.net) depends on multiple services from multiple vendors for implementation. Many of these vendors are implemented in the browser through JavaScript and utilize cookies as well. Certain browsers, e.g. Chrome and Firefox, provide extensions to manage JavaScript execution (e.g. NoScript for FF).
When visiting BlueMix a link should be provided that informs the user of the various services being employed, their functionality and purpose, and what information, if any, they are collecting and intended use.
While most people do not notice these multiple service being employed or the setting of cookies, a small minority, including me, does find the practice to be both common across many Web properties, as well as dismaying due to lack of disclosure.
To experience for yourself, install NoScript add-on for Firefox and set Firefox preferences for third-party cookies to "Ask every time" and then load up bluemix.net.
My $0.02
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