I think those only need 1 test to play with them, and that’s because they are regulated by the government. They want people to follow the rules because if they don’t it can come down on all of them.
The biggest one of these that I know of is falconry which requires 1 falconry test, 1 hunt test, 1 inspection, and finding a two year sponsor. Falconry is specifically set up to gatekeep as to protect the sport in the USA.