The Chinese legal system - especially for business - is practically non existent. It's incredibly difficult to take legal action in China. It takes many years and it's hugely ineffective, especially for foreign companies. The Government just turns a blind eye to it, or allows businesses to make small differences and thus claim it's a different product.
Makers can't tell a business to stop selling a product because they think it impinges their copyrights. They need to prove it & to do so in each separate country. The costs are just massive and there are not many modelling companies with that kind of money & resources to be able to do so, especially if they are not actually losing any sales as a result.
Look at Apple. Massive, massive amounts of money- £110,000,000,000 in cash - & growing every day, the best lawyers money can buy and yet they are helpless as counterfeit Apple products get sold all over the world. There are even fake Apple stores in China, selling fake Apple products - but set up to look legitimate!
If Apple can't do it, Roden certainly don't stand a Scoobies.