>>516606040
I've run some tests today. There seems to be a script in place that runs every 8 min or so, selects any post that contains (any) image accompanied by the magic phrase (pic related), bans the poster and deletes all their posts. Due to this script, mean lifetime or a post such as that is circa 5 min.
Avoiding those by either not using the same phrase verbatim or just stuffing a few symbols in-between, the posts stay up for much longer. Still a coin toss whether they get deleted, but today most of the posts stayed up for at least 20 min, and a few peacefully reached page 11. Will see how it develops.