You do know that all we do has those kinds of problems, how to handle the different kinds of performers/employees/students/ whatever we are trying to find fair classifications for?
Forever we only had amateurs as olympians, but in reality, to be at that level of performance you had to be spending more in training resources than you possibly could and hold a real, full time job.
Rainer Klimke may have been one of the few that could swing that and even then, his time was his own to manage, not everyone can do that.
Then reality set in and today olympics have different rules.
Amateur designation in all sports is treated seriously, even in reining.
As long as rules are upheld, any other grumbling is questionable.
If someone knows a rule was broken, well yes, do speak up where it matters.
You think what an amateur is saying means they are involved in something that makes them ineligible as amateurs, there are venues to address that, do it.