Converting the tool to use OAuth would:
- Eliminate the need for the use of reCaptcha which is an end-user privacy concern if not a Tool Labs Terms of Use/Privacy Policy violation.
- The privacy concern here is that a WMF hosted web page is automatically including 3rd party assets (in this case an iframe).
- Eliminate passing password data into the Tool Labs environment which is a general security concern (POSTed password data can not be guaranteed to be secure in the Tool Labs environment).
- Eliminate local account creation without required end-user notice.