Have experience with working at a company where they (Huawei) had stolen IP.
That, and they give no fucks about following technical standards when trying to bring their hardware to market.
If I could give more detail, I would… but I cannnot.
Suffice it to say - when companies/people don't trust Huawei, there are a myriad of legit reasons for that distrust.
Understanding that should connect the dots for your other question.
They've also been proven to cooperate with genocidal governments.
https://www.forbes.com/sites/zakdoffman/2019/07/06/huawei-em...
It's more about U.S. and P.R.C don't trust each other.