Is this campaign still on going on it has ended? i am interested in participating if there are open slots.
Refer to the first page, it has an explanation for empty slot. Currently, Full Member and Senior are all occupied. Here, let me quote it for you
Full Member: 0.00055 BTC per constructive post. Max posts 7 per day. FULL
Senior Member: 0.00065 BTC per constructive post. Max 7 posts per day. FULL
Hero Member: 0.00075 BTC per constructive post. Max posts 7 per day. Available
Legendary Member: 0.00085 BTC per constructive post. Max posts 7 per day. Available
Although, according to the spreadsheet, they should have one free spot for FM now since one member under the rank of FM is leaving.