In fact, in a few certain situations you can actually purchase higher-end hardware than the pros use. UCI has restrictions on shape and weight that need not apply to non sanctioned riders, and there are improvements that are available in both aero and weight. Notably, Triathlon specific bikes are often markedly faster than UCI compliant bikes due to the aggressive aerodynamic optimization.
You can’t restrict the sale of stock, typically, but there are some provisions that can be adopted to make things more resilient. Check out “Poison Pills” on Wikipedia