I wouldn't think of it that way, more like Twitter for video sharing. By adding an arbitrary limit to what you can share - 140 characters for Twitter, 6.5s for Vine - and removing all friction between making the thing and sharing it, it removes the pressure of feeling like you need to make something good or polished, and you're more likely to share.
Mobile has gone way too far in this direction IMO. Making it easier to share mostly means not only that people post a ton of crap but they're too ADD to take the time to understand and appreciate content with more substance. Stuff like this dumbs us down.
