Large (mega) ministries contain within them the seeds of their own implosions. I usually start with the tendency to keep control of them within the family.
Another is the tendency to become more and more “inclusive” of ideas and ideologies inimical to those of the original founding, e.g., in order to keep the thing large and growing.
This is true of all organizations. Over time they devolve and are run for the benefit of those running it and not for what the original mission was.
Happens in charities, government agencies, churches, corporations, especially privately held ones. It’s just human nature.