Information includes username, email address, IP address, and other raw log data.
The company does not mention non-PII.
Yes. “Occasionally, the Foundation may receive a subpoena or other compulsory request from a law-enforcement agency or a court or equivalent government body that requests the disclosure of information about a registered user, and may be compelled by law to comply with the request.”In the event of “such a legally compulsory request, the Foundation will attempt to notify the affected user within three business days after the arrival of such subpoena by sending a notice by email to the email address (if any) that the affected user has listed in his or her user preferences.”
“The Foundation does note… that such users may have the legal right to resist or limit that information in court by filing a motion to quash the subpoena…. If the Foundation receives a court-filed motion to quash or otherwise limit the subpoena as a result of action by a user or their lawyer, the Foundation will not disclose the requested information until Wikimedia receives an order from the court to do so.”