There are no specific examples of what issues the data collection has created. A Google account is required. Anything entered when setting up the account is used to identify the student so if their Chromebook breaks, they can be assigned another one, login, and be up and running rather quickly. Homework is stored in Google's cloud and checked there by the student's teachers. This story seems like FUD being spread to get schools and parents worried about something that should be of no concern, just as Microsoft is releasing their new Windows Cloud Chromebook competitors. The timing may not be coincidental.