This came out a few days ago: https://www.boredpanda.com/tik-tok-reverse-engineered-data-information-collecting/
“TikTok might not meet the exact criteria to be called “Malware”, but it’s definitely nefarious and (in my humble opinion) outright evil,” Bangorlol said. “There’s a reason governments are banning it. Don’t use the app. Don’t let your children use it. Tell your friends to stop using it. It offers you nothing but a quick source of entertainment that you can get elsewhere without handing your data over to the Chinese government. You are directly putting yourself and those on your network (work and home) at risk.”
Think of this: If it’s free that means YOU ARE THE PRODUCT THEY ARE SELLING!
Is Tick-tok trying to replace YouTube?