Australia is perhaps the only country in the world that appears to always hold US interests above its own, and follows the American lead regardless of where or why.
That is not exactly correct, not is it exactly misleading. Weighing the evidence in the public domain, the Americans suspect links because the founder was a Chinese military officer and Huawei's earlier history. Since the Chinese government and economy is different from the US, and shepherded by government, there is rightly or wrongly US suspicion.
That is historical record, not shadowy anything, but if you want to include this as shadowy it could pass scrutiny.. As for where Huawei stands internationally today, this puts them in perspective.
Do you realise that at one time American exported high tech equipment had to pass 'inspection' where back door systems were either tested or installed where deemed useful. Intimate familiarity and experience with their own 'how to do' is one reason the US government understands the technologies as well as they do, but regardless appears to have no concrete proof against the Chinese companies, excepting their market and product success, which is feared.
One opinion of the 'security threat' from Huawei is they refused to work with the NSA, so no American back doors could be installed while some primitive back doors have been reported in Chinese equipment. Hard coded back doors are not uncommon to enable a manufacturer to recover a hopelessly compromised product, or to add a toy for hackers to find and use, or even for government spying as the cases may be. But China is a Johnny come lately while the US was first off the rank and will do whatever it can to stay ahead.