More than you think. On Tumblr gifs are way more popular than actual video.
On Tumblr, if you upload a 10 minute video and then post gifs of the video at the same time. The gifs will get ten times as many notes as the actual video. I’ve tested this theory out many times.
It’s not about length. People like easily consumable media that they can share. Most people use Tumblr and Vine through apps, the content has to be something that you can look at and close the app while you’re out doing whatever.
Porn videos use a lot resources. People like porn. It is shared a lot. It is not like vine is making money on the porn. A number of hosting companies prohibit porn for this reason. Tumblr guidelines: You can embed anything in a Tumblr post as long as it’s lawful and follows our other guidelines, but please don't use Tumblr's Upload Video feature to upload sexually explicit video. We're not in the business of hosting adult-oriented videos (and it’s fucking expensive).
I understand the logic you’re trying to use, but it doesn’t apply in this case.
If Vine’s own words are to believed and the “adult accounts are less than 1% of their userbase”, then the “resources” argument doesn’t hold any water. The notion that porn vines are shared more than regular vines is an assumption that isn’t backed by any kind of factual data. Especially when you consider the most popular “normal” vine accounts have millions of followers. Porn accounts typically only have in the thousands.
Tumblr isn’t a platform that revolves around video, so it makes sense that they don’t want to become a porn video host. Vine’s entire identity is video, they’re well equipped to handle the load, they just don’t want to because of the reputation it brings.
Vine has previously taken steps to hide pornographic and sexually explicit videos shared by its users, but today it’s outright banning the content. The company has updated both its rules and terms of service to prohibit sexually explicit material. “As we’ve watched the community and your creativity grow and evolve, we’ve found that there’s a very small percentage of videos that are not a good fit for our community,” the company said in a blog post. ”For more than 99 percent of our users, this doesn’t really change anything.”
It seems as though Vine is also looking to head off any censorship controversy by outright admitting, “We don’t have a problem with explicit sexual content on the Internet –– we just prefer not to be the source of it.” The changes are effective immediately, and Vine has posted a help center article to help users understand what sort of clips are permitted compared to those that are now banned. Videos of sexual acts, sexually provocative nudity, and closeups of “aroused genitals underneath clothing” are strictly prohibited — as are artistic or animated videos that are sexually graphic.