Earlier quoted context omitted.
We can see the same with everything in the US. Huawei became very competitive to Apple. Outsold Apple in it's home market. Huawei got banned. DJI has a near monopoly on drones. No US company could compete and players like GoPro shut down their consumer drone projects. DJI got/is about to get banned. Tiktok was dangerous to Meta. TikTok got almost banned/forced-sold. Chinese EVs are better than almost any US offering.…
I agree generally that protectionism is bad, but the examples you present are just the US (finally!) doing to China what China has done to the world for decades. They rely on relatively unencumbered trade in Western markets, while locking their own markets up from outside competition.
What you're talking about is social networks/messengers/news which are limited not so much for competitive reasons but national security reasons. They like to control what people see which is something a Google, Meta or X cannot guarantee.
You can very much buy US software, e.g. https://www.microsoft.com/zh-cn/microsoft-365/buy/microsoft-... etc.
You can buy a Prada bag, a Ralph Lauren sweater, the newest iPhone or Mac, a Model Y, adidas or Nikes, Adobe Photoshop... etc etc