Although we do our best to keep a close watch, and a lot of members report such posts whenever they are spotted, a few do slip through the cracks. When a violation is spotted/reported, we as the Mods edit out such portions, and leave behind a cautionary note. If the violation is repeated, the offender is usually banned.
I hope this answers your query.
Kindly help the forum by keeping within the rules, and by reporting any post that you think needs intervention. There is a 'Report Post' link at the top right of every post.
Thanks.
AMITBE.