See https://office.wikimedia.org/wiki/Product/IP_Masking
IP masking will impact TheWikipediaLibrary extension. The extension will not work with temp accounts because it depends upon setting a preference, which temp accounts can't do (see T326816: Update features for IP Masking).
We already have a number of simple checks on user accounts in our code that decides whether or not to send a notification, and all we need to do is add an additional check for $user->isTemp().
Deadline: September 2023