The DISPUTE tag has not been helpful enough; it doesn't show unless someone mouses over the user's profile and it's too small to be noticed.
My suggestion is that whenever a user has received many reports for deceit, fraud or FFK, the system would automatically replace the signature with a warning banner that is unremovable (changing it would still revert it back to the default banner) like this:
Steam has done this, which serves a very good purpose on raising awareness:

This post has been edited by UserU: Jun 23 2016, 05:34 PM
Jun 23 2016, 05:33 PM, updated 10y ago
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