They didn't pay their developer and copied the whole commit for them to be able to use it. This is a clear sign of a "SCAM". This is now their Official Development page : https://github.com/BitcoinInterestOfficial/BitcoinInterest . It was updated last year.
These guys can't be trusted. Don't be fooled by airdrops and forks. If you buy into it, you'll lose what you have.
I just wonder why no one from the developers longtime do not reply these kind of serious facts. May be it is really better to wait and do not invest until a dev. make a clarification.