People can consider anything they wish when entering. Any show.
No schooling show that I know of is adhering to any of that.
One of the reasons that the USEF shows are so expensive the many regulations they are monitoring and enforcing (or attempting to enforce). Maybe this is a ‘you get what you pay for situation’.
The ginormous AQHA is also connecting with SafeSport through the USEF, so altogether that would be a giant chunk of all of the people who show horses, in the U.S. But undoubtedly there are many branches of horse showing that aren’t connecting with SafeSport as well.