> A trust that says you don't get access to the rest unless you graduate college isn't meant as motivation?

No, a trust that is setup to give your family money when you die, in order to serve as motivation for you to "break through new frontiers of excellence"

This isn't motivation though. This is a reward for achieving a place on the Olympic team. If this does not continue as a thing past the upcoming Olympics, athletes will still train in hopes of qualifying for the next team. They won't be doing it because this might be available to them. If they qualify, this will just be a bonus.