Your question was probably rhetorical, but I'll answer it anyways: TikTok's userbase and revenue generation are massive.
It will be extremely costly for Google or Apple to remove TikTok simply because of its massive fanbase of everyday users - remove TikTok and you get millions of pissed off users, and for what?
Those users didn't care that their data was being harvested anyways (any cursory Google search will reveal TikTok's data harvesting policies), they care about the the fun app that they love spending hours on everyday, and now the tyrants at Apple and Google are taking their fun away.