I don’t imagine discussion of what’s happening to the Uyghurs is getting much traction in TikTok either.
Movement against TikTok started started with the Trump admin well before Oct 7, 2023 [1].
I think this is less Israel / Palestine and a better explanation lies elsewhere. Namely, that anti-China sentiment has been growing for a while now and Meta has plenty of money to burn (on the Metaverse, Lobbyists, etc.)
The actual law was passed after accounts of spying on Hong Kong citizens were made public [2].
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1 — https://trumpwhitehouse.archives.gov/presidential-actions/ex...
2 — https://apnews.com/article/tiktok-china-bytedance-user-data-...
Only after the strong shift in sentiment by younger Americans on Israel's genocidal actions did the effort renew with vigor.