It seems you don’t have a good idea about what a backdoor is. A tiktok app can’t spy on your email or Facebook message. It’s reasonable to worry about whatever

It seems you don’t have a good idea about what a backdoor is. A tiktok app can’t spy on your email or Facebook message. It’s reasonable to worry about whatever data you give tiktok, but you should probably worry a lot more about Facebook or google which collects far more private data.