This is one of my favorite sites because it not only points out these scams, but teaches you how to spot them yourself. It’s a useful skill to learn not just for writers, but for everybody. It’ll teach you to trust that red-flag-alarm-bell in your gut that says “Something is off about this.”
From the site:
Shining a bright light into the dark corners of the shadow-world of literary scams, schemes, and pitfalls. Also providing advice for writers and industry news and commentary. Writer Beware is sponsored by the Science Fiction and Fantasy Writers of America, Inc.