Has anyone here use to get gigs on peopleperhour?

Hi everyone! Just want your advice on this. Has anyone here use to get gigs on peopleperhour? Have you encountered someone who's asking for an "insurance fee" first before they grant you the job? My client is asking for a 5GBP insurance fee, though the payment is really tempting. The offer is around 400GBP just to finish editing an 85-paged file.

Is it a red flag? I need your help.