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Re:Buttercoin – US-based Bitcoin exchange by marcbarbosa on Friday February 28, 2014 @05:32PM (#7321994)
I don't think it's a scam. According to kevin-buttercoin comment a month ago, they are working on Scala based version, and it will be opensourced.

Source: https://github.com/buttercoin/buttercoin/issues/65

Re:Buttercoin – US-based Bitcoin exchange by 1qaz2wsx3edc on Friday February 28, 2014 @06:27PM (#7322245)
I've actually talked with Kevin before, they do seem to care about open-source & security & scalability. I mean, from what we talked about, I got the sense they do. But for them, I think things are moving fast, and it's hard to please everyone, all the time, especially when you need to prioritize the business. It seems they care about open-source as a reassurance to security. And I think they do want to give back to the community.