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Well, I envisaged that the more the users increases the thinner the curation upvotes will be, but to be totally out for over 7 days looks funny.

Perhaps your posts fell short of the criteria?

I don't think so, I use to see their upvotes in every two days when I haven't subscribe to premium. Only they know why it's like that right now.

Throughout the period I spent without premium, I never got a single upvote from them. Even when I sub to premium, the upvote is unpredictable for me, but I'm glad as long as I'm able to make enough for the next sub.

Since I got the subscription I have only been voted twice, and I have just 13 days left before the premium expired.

13 days is still a lot of time, provided you write posts. 5 straight upvotes and you should be close to ROI, at least.

I just hope it works as you said.