When I first started writing on Medium, I tended to use American spellings. Mainly because I had Grammarly set to American spellings. Then I decided to set Grammarly to British English because I didn't want to keep being told that my spellings were wrong when they aren't. That said, we do have some stupidly spelled words. All the ones with "igh" and "ough" in them, for starters. Bloody stupid language, if you ask me.