Have you experienced your post deleted by the admin?
For a writer, being rejected is a dent on the ego. When you create a discussion and later on the admin would delete it for reasons that it is not related to the niche then that will make you think. Naturally you will review the topic that you created if your post was indeed out of tune. But if it is related to the niche then the admin may not like you as a member of the community. By the way, the culprit can be the admin or the moderator.