I still find this whole topic silly because as far as I know, objectively a kilobyte is and will always be 1024 bytes.
My IT teacher back in the days taught me that they only started saying "it's actually 1000 bytes" for the dummies who can't remember the 1024 and are like "UHH BUT IT'S KILO HURR DURR", lol.
But yes I am aware that they tried to introduce kibibytes / kilobytes in 2000 but it never really managed to push through - It's not really used.. It was an attempt to make it more clear but it didn't really work out.
I'll always say that a kilobyte is 1024 bytes and nothing will change that.
You might aswell ask "What's a kilo" if you really want to use 1000 as the correct answer tbh.