Why does Alibaba partner? Jack Ma himself can develop new blockhain. Computer engineers can work on this issue. A partnership can be made. However, I interpret this situation differently. I think that only Alibaba.com's name is being advertised.
In my opinion, blockchain technology can be applied in various business sectors including the retail sector because it is more secure in data storage. Using blockchain technology does not mean that Alibaba will publish its own cryptocurrency because blockchain technology could only be applied in their applications to secure the transaction data they have
They dont know the exact reason why but its good that they adopt a blockchain instead of creating their own and maybe, they want to work with that company and later on be the owner as well. Jack Ma has the capability to do what he wants, hes a billionaire but since China is still the boss of Alibaba they have to create a decision that will be in favor to them and to China as well.