Honesty is a good point when it come time to submit and take credit! I have made a lot of creations from scratch, including some of the gifs I've posted. Some of those have done well, most have not. I am most grateful if and when my original creations get featured by the moderators. They don't always get featured, that is a risk one takes when hitting the "submit" button.
When I was new, I copied a gif from Giphy and posted it on imgflip. Apparently someone somewhere did the same as me a few weeks before I did. It was an issue to someone somewhere. That sucked, mostly because the users who were immature about the situation weren't claiming the gif was original, just that mine was a "repost". Seemed a bit dishonest and hypocritical.