hmmm.... here is something ... I found workaround... install plug in for duplicates.
so... some of them were blocked

for rest like entering too much description... bla..bla etc
went to database set description field to XX spaces. So, when someone submit, they are happy with long list... & everything shows up as they wanted, but in fact only XX amount is added. (original idea)

Fixed, users using ALL CAPS... in heading or disc etc... found plug in to correct it (great plug-in)

looking for a way to mark the user a spammer & just block any submission from him, w/o letting him know. that way he don't create new user & continue the BS addition... (shows the spammer as if everything is OK with submission on his side.)

that is true...
ISP sites will be a issue for duplicates... don't see much help unless some clever idea to detect it... like
submit...
www.xyz.com
www.xyz.com\user_folder\
are fine.

where as...
www.xyz.com
www.xyz.com\abc.htm
www.xyz.com\def.htm
not fine... so blocking multiple files at same level are blocked (give some help)

I hope this makes sense.