Absolutely no pros whatsoever. The whole thing is a scam.
Cons
Don’t get sucked in if you are offered a weeks unpaid trial. No matter how hard you try they will offer you to stay on for another week unpaid whilst getting you to do skivvy jobs like re organising their stock cupboard etc and then completely pull you apart about it and tell you you weren’t good enough. At this point they will then take somebody else on for an unpaid trial and rinse and repeat. I know lots of people this has happened to.