I hope I answered the question.
Ran
This is the worst way I can think of to fight fake news. You should rebrand before you launch and just call it steem news flaggers.
People at home on their computers with or without coin are not capable to determine what is real or fake or accurate or not. Its an idea that can't posses any accuracy. Actually looking at the comments of some people here they can't even determine the day or the week. Why would you give someone voting power over what they have no clue about.
If you want to fight fake news, join a trusted platform with a proven track record.
https://www.corbettreport.com/If someone isn't reliable in flagging fake news (flags real stuff, doesn't flag fake stuff) then his/her opinion won't be considered. Once you operate at a large scale you don't need most of the people to understand what's fake and what isn't, you only need 0.1% or 0.01%. And if we can't even find that, then we'll apply the second point - relying on prominent pundits that you trust to decide what's fake and what isn't. That's seems similar to what you wrote about a trusted platform.