The reports come as Facebook's WhatsApp starts to roll out a disappearing photos and videos feature.
TikTok and ByteDance did not immediately respond to a BBC request for comment.
The news comes as Facebook-owned WhatsApp is rolling out a function that allows its users to have photos or videos vanish after they are seen. On 3 August, Twitter discontinued its Fleets function which allowed users to post photos and videos that disappeared after 24 hours.
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