Have you taken a look at the accounts participating in these contests? It's quite disturbing as they do nothing else beside enter them. Like quite literally just that. Seems like you have a sockpuppet farm on your hands most likely most of the accounts being run by the same person. I'd suggest making entries require a bit more than whatever some of these accounts do, example:
https://peakd.com/@ayahdindin/comments
https://peakd.com/@ghinamidrara/comments
etc
I didn't even look at all of them, these were 2 out of 3 I looked at but it seems quite obvious what's going on here and I don't think a couple people farming these collage contests should receive the post rewards these posts earn.
Yes, we are on it. Sockpuppets have always been coming in waves to the LMAC. We have always been able to contain the issue by changing our modalities. However, the recent wave is the most severe one so far. We are now confident that we are able to identify most of them reliably and have now agreed on the criteria which will prevent these accounts from receiving any rewards through our trail. While the one or other sockpuppet may occasionally sneak in, consider the issue being dealt with.