Beware: Instagram and TikTok and all of Facebook's apps store "eternal cookies" on your iPhone via the iOS "Keychain", separate from browser cookies. Those coo

Beware: Instagram and TikTok and all of Facebook's apps store "eternal cookies" on your iPhone via the iOS "Keychain", separate from browser cookies. Those cookies persist even after you delete the app, even if you completely disable and sign out of iCloud, and even after you restore your iCloud back on another iPhone/iPad. There is no way to see or delete that data, except by using those apps, if they offer you an option to delete it, and so there's no way to be sure if that's all the data they store.