I've always assumed I have zero privacy on all social media apps. I am more worried that if the next few major social media apps are all Chinese, then the Communist Party of China will control what the world sees and believes.
They seem to only be able to do this by copying existing platforms that were successful. TikTok is essentially a carbon copy of the discontinued app Vine. I cannot imagine that the pool of discontinued apps that otherwise would be runaway successes is large.