Unfortunately this type of thing happens all the time and even more so on decentralized systems. I know of one cryptocurrency soon coming out that will track plagiarism im not sure how far reaching it will be but id be curious if steemit could adopt it into their system or create their own internal system.
Sorry this happened to you but keep cracking out awesome content and you will continue to be rewarded. Its also good you add your own picture etc to it perhaps even think about adding your steemit tag to your pictures or some type of watermark that people can see that shows where the content belongs to what account could also be a move in the positive direction to combat this type of behavior.
Ooh interesting! Finding plagiarism is one of the hardest parts of controlling it... and so it would be awesome if there was a way to automate so e of that work.
Also, great idea to use some kind of watermark or personal logo. I can see how that could help deter some people from stealing.
There is a bot cheetah that does this check no?
its okay... it happens... you should feel honored...
Sad but thats the truth...
All the best for the rest... i hope they dont get stolen :)