Ansible "User" module leaks any data which is passed on as a parameter to ssh-keygen. This could lean in undesirable situations such as passphrases credentials passed as a parameter for the ssh-keygen executable. Showing those credentials in clear text form for every user which have access just to the process list.
A process is invoked with sensitive command-line arguments, environment variables, or other elements that can be seen by other processes on the operating system.
The product does not encrypt sensitive or critical information before storage or transmission.