One thing that I found very interesting when I looked into what TikTok does: it's scary good at aggregating data about you. I live in a foreign country, my phone's network is behind a VPN to a different foreign country and I gave the app no extra permissions, yet somehow I still got recommended content from the country where I was born. Since it's a small country there's no way that's a coincidence. I'm both intrigue…
I think they use the SIM card country ID and also the ad audience categories to suggest content. For example swapping the SIM card with a fresh installation of TikTok shows different "local" videos. Even if the public IP address is unchanged like when using WiFi instead of Data. I've also think they use ad categories to suggest videos. Using a fresh TikTok installation and then spending some time navigating a subredd…
Carrier, iso country code, mobile country code, mobile network code, and more are all easily accessible data attributes.