While macOS did indeed primarily switch to KiB, MiB and Gib, it does at times still report storage as KB, MB, GB, etc., however it uses the (correct) 1000B = 1KB
And afaik, Linux also uses the same (correct) system, at least most of the time.
The only real outlier is Windows, which still uses the old system with KB = 1024B, some of the time. In certain menus, they do correctly use KiB