Politics at their finest
The joys of being a toady to the US government. The evidence in the wild is that Huawei has some sloppy processes and sometimes misses best practices, but the supposed 'smoking gun' is the founder has ties to the Chinese Communist Party, eg the government. The Americans don't seem to care about open malfeasance or anything else on their own turf as long as those dollars keep flowing, but let a competing system have a go? Not on to them and the long arm of the US will do whatever it takes to keep its vassals in line. If the US is not at the helm it will change the rules in whatever way is required to put the competition out of business. Been there, seen that in other high tech industries.