Pretty much every article I can remember about Huawei mentions that "experts" and "officials" are "concerned" about China backdooring Huawei's products, but has there been any cases of that? Or is it all just speculation? TikTok is the most popular app in the world and China barely has any control of it outside of its borders.
I don't know of any hard evidence but my philosophy with tech is just to imagine you're being spied on by every major government inthe world no matter what you do. If you don't know enough about how to avoid these things that you need to ask a question, then you probably are known to some degree.
The cool thing about this though is that they don't really give a shit about you that much unless you actually become influential and rock the boat at the same time. Otherwise 99% of the time you're just data on a spreadsheet that will only be seen by actual human eyes for a few seconds as they scroll by.