Language barriers... Several Chinese model company's purchased Ancre drawings and used those drawings to develop kits. This is perfectly legal when those models are for personal use. However, once they become kits "for sale", then a proper "commercial use" license must be purchased from Ancre. Due to language, legal and cultural differences many people in China (and elsewhere) did not know this. It was not intentional and not stealing.... it was by mistake. Uwe has helped to bridge that gap and these companies are now beginning to work together to obtain proper copyright licenses to produce their kits.
I am not sure why this has not been explained until now. It should not be a secret. There is no ugly underground pirate model building industry.
I have seen the very same mistake made by people living in the USA running small businesses who just did not understand the law. It is not a malicious crime, it is just a misunderstanding.
Regarding whether you can or cannot PURCHASE a model kit on the internet. As a CONSUMER, you can buy ANYTHING you want, and BUILD anything you want. There is no crime against this as long as it is for private personal use. If it can be legally puchased from Ebay, Amazon, AlliExpress or any other E-Commerce platform it is, by definition legal (International Free Trade).... If you are buying it for personal use to build your own model it is, by definition legal (Fair Use). Copyright issues are for the kit makers and sellers to worry about... not the consumer.
Do not let anyone tell you different.
Sail on.