My how the horse world has changed. And the irony of this statement
I am old enough to remember when you HAD to be an amateur to be on an Olympic team, and under MUCH stricter rules than USEF/AHSA. It was a BIG DEAL when that rule was changed, and Rodney Jenkins was allowed to ride for the US team.
In the 1960s my sister, then a teenager under 18, was offered a job helping to break 2 yo race horses. Before she started she was warned: “You know this means that you will never, ever, for the rest of your life, be able to ride on an Olympic team.” (She took the job anyway.)
You should read Jimmy Wofford’s autobiography “Still Horse Crazy After All These Years” about how he “invented” the concept of a working student as a way to get around the Olympic Amateur rules.