Here’s what Chris Boulton, himself, said on his blog, in regards to LiteBulletin
When we relaunched MyBB under the GNU GPL license (open source), we did so to help out the open source community and to hopefully see something new and original. We also did so as we believed we’d receive some valuable contributions back to the MyBB community. We didn’t release MyBB under the GNU GPL so people would take MyBB, and turn it in to cheap clone of a competitors product. Whilst there’s technically nothing wrong or illegal doing so, it’s disappointing to see.
LiteSoft are developing LiteBulletin, a direct clone of the vBulletin user interface plastered directly on top of MyBB with the addition of vBulletin’s recently developed social networking features (social profiles, comments, etc). Of course, LiteSoft did this and at the same time vBulletin caught up with them as (I’ve heard) they were using actual images from vBulletin itself. They’ve now changed the infringing material.
This is turning into more of a Soap Opera, isn’t it.