I created a lens for a Hackathon: a rocket with our logo on it.
The lens was first approved, and was live a couple of minutes, but was then rejected.
It is totally unclear to me why. It would be nice if SnapChat could be more specific and write a line or two about the specific reason a lens was rejected. Just refering to your guidelines is too vague.
Apple is much better at this when reviewing apps for the app store, for example.
Otherwise I will think twice in the future before investing my time in something that leads to nothing...
Which would be a pity, because I really like Lens Studio!!!