Comment by jameslk

The common thread here is that it is China. Before the 2010s and earlier, the US wasn't so concerned about China, but ever since then, China has been a big US concern for it being a technology and military rival

e.g. the Investigative Report on the U.S. National Security Issues Posed by Chinese Telecommunications Companies Huawei and ZTE report from 2012:

https://stacks.stanford.edu/file/druid:rm226yb7473/Huawei-ZT...

From that point forward, that concern has only grown. So you can view these actions as screaming "we were only for the free market until there was no competition" but if you want to genuinely know the answer to your question, the publicly stated concern is "China is a national security threat"