There is so much doubt in this comment section around the validity of the accusations. We have a number of countries putting forward the knowledge they have mutually agreed upon. What is shared is known to a high degree of certainty. Any details that are questionable would not have been shared prematurely.
Not to say I don’t believe that China is actively attacking networks and services (if they don’t then they’re lagging behind and it’s embarassing), but I can understand the skepticism of grand claims when the latest was that tiktok was impacting national security.
Wait, it wasn't? I'm not sure why this is a controversial opinion. Social media has often been linked to information leakage. Geo tagging of photos was part of the proof that was used to show that Russia invaded Crimea. Similarly US soldiers have had their locations revealed when posting on Facebook/Twitter/Instagram. In fact if you're over seas and talking to your partner back home they generally have another soldier listening to the conversation. Given all this why is it surprising that a large social media platform that focuses on videos (which reveal more info), grabs a lot of data, and is connected to the US's largest geopolitical adversary is considered a threat?