Hi @efferman, I contacted the company yesterday. They wanted to send their apology. Your set is extraordinary and they have no plan of copying your model. One of their staff bought your instruction and made it. However this couldn't be an excuse. They wanted to show their muscles in the exhibition but it was their muscles.
I can't guarantee there is no copying in future, but many good Chinese companies value IP as well or at least things are changing in a good way. CADA 488 is a good example.
Also, They wonder if you are interested in working with them to make the model a real set. But without your authorization they will never product this model. And again they are sorry for presenting your moc without your permission.