Is there a canon reason why everyone speaks BRITISH English in Horizon?

I understand why everyone speaks English, because that's one of the only languages that was preserved and Apollo was primarily written in just 4 languages, but why BRITISH English? No one has a British accent and as far as I remember, neither the Alpha of Apollo nor Sobeck were British, yet apparently they didn't just choose to preserve "mum" over "mom", but inject entirely unique words from British English into Apollo, like snogging.

Actually, now that I'm thinking about it more, was British English even taught to them? Wasn't that erased? How did anyone in the future, in what once was Colorado, surrounded by relics that do not use British English, ever learn some of these words? I need a canon answer this is bugging me.

Edit: And to add, I haven't noticed any British English in any of the audio records, so it seems to be a future phenomenon only! The devs must have intentionally made everyone in the future speak like that but why!

Edit: I don't know why everyone is assuming I'm talking about accents. I'm clearly referring to the word choice by characters. Obviously they all have American accents otherwise it wouldn't seem strange. I'll be damned if I'm going to sit here and be downvoted because some people were too lazy to read the post properly. https://www.youtube.com/watch?v=PRLP-flgad4

1:06. Just one of many constant uses of British American vernacular spoken by people with American accents

thank you for turning someone fun and unserious into something miserable