Hollywood has built up a whole network across the globe and within each country. Marketing a film involves studios, magazine editors, film critics, talk show circuits, and a host of other channels. It is not as simple as hiring a marketing firm.
Hollywood also has the advantage of having English as a global language and a bevy of actors who have been marketed over the years as movie stars. The only foreign movies that make it big globally are those which get the nod from Hollywood's marketing network.
Even Britain can't compete with Hollywood, nor can Europe, never mind the rest of the world.
Certainly there is a language issue. But even so many movies are just dubbed. In Western Europe
every movie is dubbed to the local language. So it doesn't matter if the original actors were speaking English or Chinese...it's going to get dubbed to Spanish/French/German/Italian/whatever.
Here's what Top Gun 2 sounds like in Germany
Now you could claim you can just dub a Chinese movie to English and then just follow the rules that the American film companies use...like putting local language subtitles or something.
Of course some US film studios are beyond advanced at dubbing. They have spent decades doing this and know they can make tons of money if they pull it off gracefully.
PLUS this may give them a distinct advantage in foreign markets because they have a proven track record of satisfactory dubbing and this will just get their movies automatically greenlighted to the major theater chains instead of being stranded in minor chains reserved for foreign language films.
For instance in the US I don't think you can have a film in a major movie theater that has subtitles. I have never heard of this. It likely has to be in English (likely really good English too) otherwise you get sent to the minor theaters.
Infact I think the original Mad Max had some release issues and had to be dubbed because of it.
Original Australian..with the "wacky redneck Hillbilly voices" which Americans wouldn't take seriously as it sounds like a movie about some
"Dukes of Hazzard" okies from the flat state of Kansas running
completely amuk with the helpless local backwards police...which most Americans would be smirking and finding rather hilarious. Meanwhile it is actually about a post nuclear war world.
Re-dubbed..with the "tougher criminal city-type voices" and tougher police voices which would not raise eyebrows with Americans making the post nuclear war scenario more plausible.