Beware of this program. One push of a button to start recording a WebM that automatically gets uploaded with the link landing in your clipboard is too much power for one man.
So configure it to not automatically upload. I have it capture stuff to a local folder, and from there I can tell it to upload (and which service).
What? the first time you capture something it asks you explicitly if you want to upload it or disable the feature. You might have missed that.
Mind elaborating?
I can say that I've accidentally uploaded my entire screen to imgur when I meant to only upload a portion of it. It doesn't give you confirmation that things are about to upload.
You can open the Imgur deletion URL for uploaded images in the history screen. However it appears that Gfycat, the default service for screencasts, doesn't support this feature.