Oh, I would say, based on my own addressing of certain subjects, that there's all kinds of things that could and really should be considered unethical. :) And I've seen the cheetah bot get carried away with what it's determining to be original content, too.
There are people here (because I've read their comments or posts) that would rather others not use even their own content if it's been posted somewhere else. I don't personally subscribe to that because I think you should be able to post anything that's yours. That's the actual definition of original content, not original to Steemit.
So far, everything I've put up has been unpublished elsewhere, but at some point I will be wanting to post some things I previously wrote on Facebook.
If cheetah or other plagiarism bots can't differentiate—especially when you go out of your way to state, "Hey, this is something I wrote on my blog five years go," in the body of the post, then it flat out needs to be reprogrammed to be able to pick up those finer points.
You shouldn't have to prove if it's original content. They should have to prove it's not. And then, the originality needs to stay with the user, not whether or not it was published somewhere else before Steemit.
"That's the actual definition of original content, not original to Steemit."
Thank You, and good points all.
For my part, I am about out of older material. So it's a brave new world now.
I have high hopes for Steemit, and I hope that it stays that way...
Best!