There are many factors to that, in answering your question, but one of the factors is that there's no common ideology that binds these groups. They come from very different vectors of society. They have different personal grievances. They come together for one specific purpose and then they diffuse again and go elsewhere.
In the RMVE space, we have traditional threat actors that have one common ideology that they all follow. It's a very difficult and different circumstance, hence why we have really tried to identify and articulate the different groupings and why it is that these activities are different.