This SurvivalModified Module prevents AFK fishing.

Fishing bobbers near AFK players that hold a fishing rod get killed.
Thus, it not only prevents AFK players from fishing, but also prevents the AFK players from being dragged with a fishing rod.

For more info and how to install, visit the SurvivalModified Module Manager Submission.
If you have any further questions or found a bug for this module, please use the comment section below.