Unfortunately file metadata is not proof of when a file was created as it can be modified after the fact, and we only allow specific emotes to be uploaded by a one person. You would need to use the sharing feature if you want their emote in your channel. If you own the copyright on the content you can also send a legal DMCA takedown request through our contact form: https://nightdev.com/contact
You should select ‘to resolve an account issue’ in the ‘Why are you contacting us?’ box, this will reveal the rest of the form and allow you to finish filling it out.