This is about handling the PII. From what I understand, you can ask for an IP if it is required for the application's functionality, i.e. "due to technical lim

This is about handling the PII. From what I understand, you can ask for an IP if it is required for the application's functionality, i.e. "due to technical limitations, we need to know where to send the response", but you cannot automatically use it for marketing purposes, i.e. "sell the IP to third-party advertisers which can then build a profile of that IP's site visiting behavior".