Metal recasts do exist indeed, a minority compared to the vast amount flooding a site like eBay.
I'm afraid the only possible protection against this plague is information and study, a lot of study, knowing what that elusive extremely rare figure you've been looking for really looked like.
Looking for a number of obvious red flags, the same we use against phishing emails.
Was it cast originally in metal or resin and by whom?
How did the packing looked like, was there an info sheet, who was the sculptor and the manufacturer? What was the original price
Is the legit company still in business, have their rights been sold, where were they based and so on?
How comes that piece of pure modeller's delight produced in the UK or anywhere else in the western world, suddenly turns up as an incredible bargain in a shoddy cardboard box in China, for instance?
My apologies for not sounding woke or pc, but scammers and remasters don't fit in my world!
Pierre
BTW The bright blue-laced PM recast with its oversized agricultural tool looks hilarious!