???

Champagne is not a process, champagne is a region of France.

The method is called champenoise and of course it is used in many different areas to make different wines, (cremant, prosecco, spumante, etc) and each of them is really different from the other..

Of course any sommelier could distinguish champagne made in France by sparkling wines made wit the champenoise method somewhere else...

A region doesn't hijack a name, it simply tells where a product is made, you could have the same blend of grapes in a red wine made in the US and in Italy and it will taste different.
Shiraz is a grape not the name f the region, it doesn't define the taste but the name of a particular grape.
You can grow that grape anywhere in the world but you can't grow the champagne territory anywhere in the world.

The same goes for many other kind of wines... Valpolicella for example is the wine that grow in the Valpolicella area in Italy and even if you can make a wine with the same blend everywhere in the world you can't call it Valpolicella because it's where it is made that makes the difference not the grapes that are used.

The same goes with Tokaij, an amazing Hungarian wine. It was made in a particular region of Italy too until a few years ago, and the Italian Tokaij, while a little different, it was great.
But then the one made in Italy could not be called Tokaij anymore because it was not made in that particular region of hungary so they were legally forced to change the name in "Friulano" and leave the Tokaij name to the ones made in hungary.

Etc etc etc