As long as you state that it's your OPINION that it's a scam and that the screenshots are taken from their website. You're entitled to have an opinion.

And all the evidence I need is in those little clips

Although I am pretty sure if it becomes a lawsuit, I have the better case.

Thank you very much! I will post the review. I really appreciate you, Janelle and Marcus.

It was reported here at WA that some were sued for doing this.

Oh! Clips! Yes I do that too sometimes. It gives an insider view. As yet no one has objected. J.

Hi Richard. You can put your clips into direct quotes " " on WordPress sites. You can also state that you are quoting directly from the site.
There is no law against stating your honest opinion. If you fear retaliation, soften your language without losing the message to your readers.
Janelle

Do you mean you took some screenshots of bits of the website? Or you are using some of their images?

I do this kind of thing too when I am reviewing scams, as it's the best way to show your readers what you are talking about. Maybe there is always a slight chance that one of the site owners will get in touch and ask you to take it down. It's never happened to me, though.