Anchors only spawn when somebody gets near one of their spawn regions. Once spawned, they use a Generator (mobile spawn region) to spawn their guys. The Generator is somewhat bugged in that it sometimes spawns out of control and other oddities.
So, that would also have to be fixed before this could occur. Because, in my mind, this all starts with anchors.
Yes, it could be done if the system were detailed and enough time and priority were given to it by the tech team. And if the rewards and a variety of invasions as well as locations were defined.