https://www.cnet.com/news/the-huawei-controversy-everything-you-need-to-know/

But the core issue with Huawei has been concerns over its coziness with the Chinese government and fears that its equipment could be used to spy on other countries and companies. It's the reason why the US banned companies from using Huawei networking equipment in 2012.

Over the last few months, there has been an upswing of scrutiny on Huawei, with a number of countries banning the use of its networking equipment. That's why its smartphones are virtually invisible in the US despite its massive presence around the world.