They might have copied the idea of Lockchain but they also developed it further. They take the decentralization aspect one level further. Dispute resolution, review system profile and authentication is done in a decentralized manner. As one can see from the image Lockchain only uses the blockchain for the listings and the payment.
I'm a great fan of the Origin Protocol (originprotocol.com), which provides a library for developers to create decentralized market places. Beetoken is built on top of it and benefits from other decentralized economies, since they have one common reputation system.
I would not argue over something, i have not done my research about i.e originprotocol.
However, fewer people know that LockChain Engine automatically Buy/sells Fiat into LOC at the time of order placement, incase the buyer does not have LOC. This is a unique model in itself, where people still prefer to make payments using cards and the trend will continue until majority of customers fill up their accounts with LOC.
At this moment the concern is in BeeToken's team's capability of delivering what they are promising. So far they are not truthful either with the investors by rewarding unfairly at an unprecedented levels, and spending investors money lavishly on creating media hype. I see them soon be joining among the list of Bitconnect, TRX unless they change their strategy.