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I don't have any idea about the points.
But I do wonder where they get the "Each ebook is free for 1 day only" part from?
The books I've seen listed there are also on the freereadfeed.com site, and these books are usually free for quite a while.
Now, some authors or publishers might have a deal or offer freebies for a single day. (Or only a few hours, or until X number of books have been given.) That would be worth signing up for. But not for just the regular freebies listed at other places.