The Verge's Chris Welch says:

The Xbox One's Upload Studio is designed to help you share your most exciting gameplay clips with friends. But as some early console owners are already finding out, using profanity during those recordings can have consequences. Microsoft has confirmed to The Verge that it is handing out temporary Xbox Live bans for select gamers found to be using "excessive" foul language in content created with Upload Studio. Most users aren't being prevented from playing online games, but instead are barred from attaching Kinect camera recordings to their gameplay clips. In some cases, they're temporarily blocked from using Upload Studio at all.

I have never once played a multi-player game online, but from what I hear, the language is exceptionally terrible, especially in terms of racism, homophobia, and sexism. I suppose this is one way to try to curb that kind of talk and make the online space more welcoming for everyone, but it seems like the sort of thing that could backfire on Microsoft in a huge way.