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Not if the users voted in the first 30 minutes, or has that been removed?

It is still there. If you vote within the first 30 minutes you will share part of your curation rewards with the author.

To simplify it - if you found an amazing post that didn't have anyone voting for it, and you voted for it right at the 30 minute mark, then after that a ton more people found it and voted on it and it made it to the trending page - you would get a large amount of curation rewards.

Still confused as to where the extra comes from though..

So it's from the curators that voted later, from their 25%?

That's right. Setting aside the 30 minute rule for the moment (assume all votes are >30 minutes), curation rewards are a total of 25%. Of that 25%, earlier voters get more and later voters get less (or nothing).

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