Re: It's marketing lies allowed to become reality.
In the computing word KB, MB, GB, and TB were all understood to mean powers of two until hard drive manufacturers noticed they could use powers of ten and claim that the size difference may very due to the space used by putting a filesystem on the drive.
I used to call the power-of-10-based units "salesman's gigabytes," since they bore no relation to what the OS would claim you had.
The TiB, GiB, etc. unit designations are an attempt to retroactively make their chicanery OK. I refuse to use them, mostly because they sound stupid when you say them out loud.