I have mixed feelings. There are things that are meant to be shared like YouTube & meme's. What it boils down to is responsible posting & upvoting.
Part of the problem is that some users with high SP will reward theses posts with $20 -$100 each. Someone sees that and starts spamming hoping to get lucky. If they were voting these posts $0.50 - $1.00 I don't think it would encourage spam and users could still share what they find funny.
After a lot of consideration and talking with several community members I think I could support dMania even with the change in downvoting weight if they were to add a function to report spam, stolen images, and other abuse for review.
I think it would be a great idea of someone who is passionate about photography & graphics to do something similar with a way of reporting images that do not belong to the poster built in. It would be a way of showcasing talent here on steemit with a reporting function for abuse.
The abuse reporting function could be tied to a bot that would reverse image search and comment if the image was found. If the bot didn't find the image it could forward the post to a group like steemcleaners for manual review.
Just some ideas that I have had after seeing the dMania site. I still think dMania will be a headache if those posting images are heavily rewarded. We'll see an increase in spam posters and with it spam comments.
Let's hope the novelty wears off both contributors and curators will use the site responsibly. If not I'm working on a scope for abuse for those who use it to sharing other Steemains meme's without permission and plagiarized images that are not memes.