Q:
Why isn't there a test-krewe?
Who’s to say there isn’t a test Krewe? They might still be under NDA
The first rule of the Test Krewe is that you don’t talk about the Test Krewe, so even if there was a Test Krewe, they would not be able to tell you.
If there is not, then the main reason must be legal. Like not being able to enforce a NDA in some countries, risking leaks that would only do harm.