I really don't think many in the West understand how interconnected business and government is in China. The scale at which companies work with the government and how the government funds companies makes it very hard to trust any Chinese company. China is the most opaque business world we can imagine and Chinese military intelligence has deep connections to Chinese businesses. They are two sides of the same coin, where Chinese military agents are even implicated in attacks on Western companies to help their own corporations.
We will never be able to truly discern the true data sharing agreements they have, and I think it's safer to ban Chinese communications companies from working in the West until things change. It's clear China has no intention of curbing bad behavior and the current approach is not working.
It is well understood that Chinese military officials carried out the Nortel hacks and gave the IP to Huawei (and others). Nothing coming from China and no Chinese company can be trusted.