"I know Steemit has a strict plagiarism concern about taking the content of others and passing it off as your own"
I don't believe that is an official Steemit policy. There are a group of people who do believe it is a big issue and work to fight it, but there is no official policy on it as far as I know. Everything the steemcleaners do is done by volunteers and backed generous benefactors who support them.
Thank you for clarifying that. I was obvious confused on the stance of Steemit itself.