I want to highlight a case that I found this morning at an important scale (more than 100 SBD/Daily).
The schema is simple just copy paste videos from several Steemians/Youtubers. No content in the post, simply copy-paste and harvesting on creators.
Here is a short list of impacted steemians for this user account 
If you see other steemians, please notify them.
This user created an account in June 2017, then this user pours a lot of steempower into and continues to do so.
It is simple to check, go down in the wallet and take the first transactions where you will see this user bought a lot of steem power, then browse the top history of the wallet and check a few transactions.
I do not think there any bot yet to detect this. It is simple to detect for this specific case: an index between urls and posts. You iterate on the content of posts in the blockchain, isolate urls (and normalize them). After you provide some service where you can just query for the url and retrieve posts associated to the given url. It can be useful for creators too if you want to create something unique, and to know about other people through their contents.
However, I do not know that what can be done to reduce this kind of behavior especially as a minnow. I would be interested to know what you think about it.