Why does a company as big as Huawei outsource part of its IT business to a technical talent outsourcing company?

Because outsourcing is more economical and labor-saving! For example, if I make a cup of soybean milk, the cup needs to be made by one person, the lid needs to be made by one person, the straw needs to be made by one person, and the core soybean milk needs to be made by one person. But these people are all my own people, and I want to pay everyone a high salary. But if I only make soybean milk, then I will outsource the straw on the lid of the cup and spend some money for others to make it for me, which will save money and time, and will not touch my core ~ soybean milk! The core code of Huawei's core technology will not be handed over to the outsourcing company, which makes the outsourcing company do all kinds of trivial things, and occasionally a technological innovation will be owned by Huawei. After all, the code you write is the asset of Huawei.