it's called Douyin. It's the same product, the same way a Mexican Coke is the same thing as an American Coke, and both are produced by the same company (Coca Cola).
The analogy to Coca Cola? Let me make another comparison: the 737 Max with one AoA sensor was made by the same company that only sold the one with two in America.
It would be more like Coke was Mexican owned and HFCS was outlawed in Mexico. Then Mexican Coke used sugar and the Coke they exported to America used HFCS. And America said, hey, you're not consuming the same Coke you send here: we're going to ban you if you don't sell to us and our plan is to keep making HFCS Coke once we buy you. You were also hurting Pepsi (Facebook/Twitter), who also only plan on ever using HFCS.
Because it was never there. Bytedance never launched TikTok in China.