Admin usually, bit of duplication checking etc. It's faster than reddit's api and you can hammer it without too much fuss.

Simple submission duplication check in python. Give it a url or some title text and it will return all entries, links and users within a few seconds.

#!/usr/bin/env python3

from psaw import PushshiftAPI
import sys
from datetime import datetime

user = sys.argv[1]


api = PushshiftAPI() 
gen = api.search_submissions(url=user,subreddit="ukpolitics")


for all_comments in list(gen):
    dateofsub = datetime.utcfromtimestamp(all_comments.created_utc)
    print("https://old.reddit.com" + all_comments.permalink, "/u/" + all_comments.author, dateofsub.strftime("%H:%M %d/%m/%y"))