"Your comment has been queued for review by site administrators ..."

I would like to know why is this new forum so strict about posting new threads and/or new comments to threads.

Not everytime but fairly often I see this warning message when I create a reply or new thread: "Your comment has been queued for review by site administrators for approval" or something like that.

I understand that pictures inserted to posts need approvation first, but comments threads??

Is it done on purpose (and if so, why) or not?

Thanks.