I'm not identifying that particular profile since they only had one review and I'm not trying to start some sort of shitstorm on someone over something that may or may not be a commercial (paid) review. (Not all fivver accounts and services are for review writing.)
I also am not trying to get the profile flagged because I suspect all that might happen is that they remove the website link to fivver. It's better it's there, in my opinion, so you know they are a paid reviewer. I'm not sure I care enough anymore to click the link to see if their one review was a paid one or one with material connection such as being the editor/promoter/proofreader/ghostwriter so should be flagged (I'm not sure that wouldn't also just make them remove "fivver" from their profile—might be better just to file FTC complaint if the review was a paid one not disclosing payment or some sort of material connection also not disclosed).