There is nothing to prevent suitably qualified people, including well-qualified aerobatic pilots, from becoming bona fide CRI(A)s (as all PFA coaches now are) in order to conduct properly regulated training.
Well, perhaps there are one or two things to prevent them. Maybe they don't want to spend the time or money acquiring what in many cases would be meaningless paper qualifications.
You'll strangle yourself with all that red tape!
Indeed.
Personally, I think there has to be a reasonable balance between legal requirements and practicality. Indeed, I'd go so far as to say that any reasonably successful lawyer in private practice has learned that lesson a long, long time ago.
Tough - it's still the law.
There are many people in aviation (e.g., bureaucrats, controllers, engineers, "consultants", physicians, instructors) who have no legal training whatsoever, but pose as experts on 'aviation law'. Typically, such people have a slavish adherence to 'black letter law' and are given to dogmatic statements, which should be ignored. A real lawyer understands that 'the law' has a strong human element and incorporates many nuances of interpretation and application.