How can I have never heard of a sport organization with 3.2 million members across the US, Puerto Rico, and Canada? It was founded in 1968.
Originally USSSA stood for United States Slow-pitch Softball Association. However, in 1998 USSSA expanded in other sports. Gymnastics was added in 2005.
Gymnastics clubs that join can opt in to camps, clinics, and competitions offered by USSSA. Those are less expensive and less competitive than USA Gymnastics events.
What often stifles upstart organizations are insurance issues. With millions of members, insurance does not seem to be a problem for USSSA.
I distrust all monopolies, even sport monopolies. More choices for coaches is positive.
Good luck to the USSSA!
More information on the USSSAgymnastics.com website.

