Well, according to Twisty they're too scared to terminate anyone right now because of Selen.It is, but the way JP legal system works, if they let any single NDA breach slide, it automatically nullifies all of their NDAs, past and future ones. This is, most likely, the only reason they ended up sending crump&dump to Raziel, to cover their ass in future. The fact, that she signed with them something that resemble NDA if you squint hard enough, allowed them to not boot out Luca.