I remember years ago when I had website up back in the V7 days. (I went away for awhile and now down the rabbit hole again I go as I am back) there was some code you could put in the register.php that would check the user inputs against the stop forum spam db.
e-mail and or IP was in the SFS db reg denied, else reg continues as normal.
with all the changes to fusion since I last used it is this still possible?