Australian BB had a Canadian on, and at least one British contestant
America doesn't have Celebrity Big Brother... only Big Brother.
Frankie Grande is not a Celebrity on any level that the term Celebrity applies... neither are half the people on CBB UK
That is why you think the "American Celebrities" are better... because they hail from the land of people who think they are better than the rest of the world due to their brief stint in Hollywood/TV land. But I personally feel that it makes CBB or even BBUK not worth watching now that they have skewed the lines of D list to A list celebrity
And, finally, America did try to adopt the format for I'm a Celebrity Get Me Out of Here... but it failed... as would CBB in America tbh... because they don't really care about D-list celebrities there... a has been is just a has been... they are a dime a dozen