I missed the campaign too but don't worry because with its initial 4-weeks planned, maybe there will be some participants kicked out next weeks, and open slots will appear. Just keep observing that campaign's thread for any good news in coming weeks.
Sad for you but its good as faucet turn into gambling site is running a signature campaign but now I am feeling they are doing something promotion for their new site which is coming in next few weeks but still very happy as they are very active and good here on this forum for very long time.
Faucets are useless (nearly) for gambling sites. Campaigns have better effects (more traffics, more users, more income) for casinos, definitely. Especially, if campaigns are managed by professional managers (that FreeBitcoin's campaign has) and very strict selection process, the quality of posts from participants will show their good returns for companies. It is very easily understandable that why good campaigns usually run for very long period. Companies receive good returns from funds they spend for campaigns, and participants also received good payments from their good works.
And if they would want to promote new website, they would launch signature campaign for it. Now they are just promoting Freebitco.in
Some old big and popular companies like Chipmixer, Crypto-games.net and few others have very long running campaigns. Maybe Freebitco.in will follow their example and it will be long term campaign. Offcourse if such advertising will be effective.
Sure, it will be an effective campaign for the casino. Why I say this? When I look at its spreadsheet, the manager chose very good participants who are guarentees for the effectiveness of the campaign.