Didn't really take your own advice in keeping your API key safe :)
Yeah :)
In most apps this would probably be a page saved on your computer or behind basic auth or be a part of your static site generator.
I thought the image was going to be sent to GitHub pages to be hosted there. Will Liveform support thousands of image uploads if it is hosting the images forever? S3 is not cheap.
Storing images on GitHub is also a good idea :) At the moment Liveform hosts the images forever. However, you are right about the cumulative cost. I'll have to think about a proper archival mechanism. Thanks for your feedback :)