True. There is so much spam and scammers are hunting down innocent traders on these platforms that auto-approval of all posts would lead to disastrous occurances on these platforms. Apart from approved members, admin has to manually approve every post, especially for the sake of first-time traders.
Auto approval of posts is a very creative idea as it can make moderators' work easier and even save time, especially if someone is in very urgent need of response to a particular issue. The problem with scammers is the only challenge, and I hope a way will be sough on how to auto identify scammers so that auto approval can also work. Just thinking out loud.