Fta:

TikTok is an international version of Douyin, which was released in the Chinese market in September 2016.[10] It launched in 2017 for iOS and Android in most markets outside of mainland China; however, it became available worldwide only after merging with another Chinese social media service, Musical.ly, on 2 August 2018.

From the links above Vine was already dying if not completely dead before TikTok was ascendent.