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I upgraded from Mavericks to the release version of Yosemite and the Feedback Assistant pulls up in Spotlight. It exists on my Mavericks machine as well.
 
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… I did a clean install and it was gone

In Terminal, please run the following command. Paste the result to this topic. Thanks.

Code:
ls -dl /System/Library/CoreServices/Applications/Feedback\ Assistant.app/
 
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