When you sign up to be a Windows Insider not only do you get the latest version of the Windows 10 OS before the general public you are also a part of a larger experiment. As such, more data is collected to improve the OS and the version you are running is merely one of many builds.
Perhaps one issue that bothers people is the Evaluation Copy watermark that sits in the lower right-hand corner of the desktop.
Full story from the WindowsCentral blog...
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