They've just thrown Scoobie under a bus, so everyone is going to know that when the chips are down that's what she'll do to them. Not a good look.
It is what MM looks to have systematically done throughout her life because there are many more people she has dropped than not. Yes some friendships and relationships break down, but when it continually keeps happening you have to look at the common cause or person involved.
The judge has already formally said that he believes MM gives OS private information and maybe this is her way of countering that. It’ll be interesting to see OS being questioned in court. Whilst I am not speculating he will commit (or her five friends will commit) perjury (because I would hope they wouldn’t) but it will be interesting to see whether he will continue to keep any loyalty towards MM now that she has publicly ditched him (same goes for JM).
At lot will depend on how OS feels about all of this and also whether he thinks he needs to try to keep H&M onside for his further career. After all, FF must have annoyed others in the RF so he will struggle to be a royal reporter if the entire family and H&M are against him so not providing any information. However, he might feel he has made loads of money from FF and and isn’t really interested in maintaining a relationship with anyone. I would hope that the other author will also be questioned under oath to make sure her story correlates with OS.