Anonymous: Why is this a poor rip off www.575haikus.tumblr.com?

I’m not certain I understand if anyone is ripping anyone off.

575.tumblr.com has been in existence for about 2 1/2 years (longer if you count a short hiatus) and posts haikus inspired by a creative commons image (all by the same author on a daily basis). 

It looks like 575haikus.tumblr.com is a bit newer, doesn’t use pictures for inspiration, and posts twice a week.  

Other than being a haiku site, I don’t see how either site could be considered in any way to rip off from the other.