It was noticed that wiki accounts are being created with username patterns along the lines of "The password to this account is xxx". Some examples as noticed by @Bsadowski1:

1. The_password_to_this_account_is_aedanlorfinkhasamajorcrushonpauldohertyssister
2. The_password_to_this_account_is_nnnnnnn
3. My_password_is_literally_just_password

(and many more)

There are plenty of clever ways to do abusive things like this where it becomes difficult for programmatic checks to be effective. But we should, at the very least, add a new password check similar to the existing PasswordCannotMatchUsername which checks for plain text passwords as substrings of the corresponding username.

Note: not entirely sure if this task should be private.