Are you saying it's based in the US? (Brit here.)
Are you saying it's based in the US? (Brit here.)
I believe the "based off of" and "based out of" were popularized among the hipster brogrammers of early 21st century, but I might be wrong.
I am not a native speaker.
You might be saddened to learn that languages are a living thing :), and only "owned" by the people speaking it. Dictionaries are always behind by definition, because they encode the words that have caught on sufficiently: there was never a new word created that was first put into a dictionary and people picked it up from there.
Basically, don't get stressed too much with language changes, because it does and always will. Or what are we to make of "brogrammers" (even "hipster" is relatively new, not to mention most of the computing jargon).