I know how to like, take those down, I found an article where you can dmca notice or contact the help center to remove those models off the platform, but i just know it'll take longer to take them off the platform, to report them, go to the support fab website and go search "report", in the first article it will help you how to report redistribution of ur models without perms, by dmca notice or contacting them, let me know if its work! (sorry if i sound off because english is not my first lenguage :((( )