It may be hard or impossible to draft a standard curriculum for all survival schools (whatever variety of survival they aim to teach). But one of the motivations for having certification is legal, and it may make some sense to create some sort of structure to prevent student deaths.

I hear from a friend of a friend a long time ago, that in the UK martial arts schools have to go through some sort of approval process that is mostly concerned with safety. This may be the role of professional organizations or of the government: making sure that people don't die from instructor's gross negligence or incompetence.

You could still get hurt from the training, but just not from potential idiocy. After all, yoga is big business with certification structures, and people get hurt regularly because of the inherent dangers that are just coming to light.