Just like they could fork Bitcoin?, And if they fork the project how they are gonna get revenue?, Ads?, Track users?.

I hate ads and have no problem paying to get ride of them, as long isn't too expensive. 

You could experiment a little with paid features and see how users respond. Start with emoticons maybe?, Add just a few and add more for paid accounts. 

Hmm Good idea but we are open sourced so they could just fork us and use the features for free then i guess

farbod

You could add features for paid accounts. Like emoticons, avatar, charge for comments. 

Don't know the state of your project but users need to acknowledge that free stuff doesn't exist. 