I think this is a really interesting move, that, if Elon hadn't fucked things up so badly, could actually have a chance of making the acquisition work. I think that TikTok is a political issue and the government would like to (and IMO should) kill because of the Chinese issue, but won't because they fear the user backlash. If Vine could gain enough of a user base to be a credible fallback option, then banning TikTok from the US market would be politically feasible, and Vine would be worth a fortune.