If I remember right Vine died(got shutdown by twitter, so maybe jack (nprofile…gaw8) could provide clarity ) after the popular people left because they didn't monitize and youtube and insta did.
Tiktok succeeds because it is like a skinner box for creators. Or maybe a gatcha game would be more appropriate since it's Chinese. Creators just keep pumping out content and praying to the algo that they strike it big.
Myspace died when Fox bought and enshitified it.