Yeah, there's definitely OC on there. There's a lot of reposts because of how new Loops is, for sure. I've seen #loops and #DogsOfLoops in video descriptions, both of which I assume mean it's not simply reposting content from other platforms, though they might also be posting to multiple platforms.
Here's some loops that seem Loops-specific (just picking out of the most recent I've posted to Lemmy):
https://loops.video/v/4VDE-V26lK
https://loops.video/v/4TI9IwwBfI
https://loops.video/v/4U23u2RLgd
https://loops.video/v/4UKQ3fJfjw
https://loops.video/v/4VHm7ju6m3
https://loops.video/v/4U-ezRPDjM
Some creators that are consistently uploading original content are:
EDIT: Oh also, @Krafting@lemmy.world created !loops@lemmy.world for discussion of Loops. I don't mind posting questions here, but I figure some people might block this community if they feel it's spammy, so you might not get some people seeing your question.