I think the implication of the question was why did TikTok become "cool" when vine didn't? They're essentially very similar.
Vine was cool - the reason it died had more to do with Twitter pretty much being in a death spiral before Trump became president. However, the biggest innovation TikTok brought was their own flavor of the algorithmic feed that made finding content a lot easier.
Vine was cool, when it existed, and there are many vine videos which got uploaded to YouTube, and there are many Vine compilations on YT with millions of views.