Every thread about speed, there's someone who's gotta say this. Why? Mbps is kinda the standard unit for speed, all you accomplish when you convert it to MBps is confuse the people who don't know which abbreviation means what, and every thread there's at least one person using the wrong abbreviation for what they want.
I think just because they're thinking in terms of file-sizes. It's easier to imagine MBps because you can look at a file on your computer, see that it's 10MB, and then know that if you had 2MBps download it would take you 5 seconds to download that file.
It's confusing for other people of course to come in and start converting peoples Mb to MB though, since we typically use Mbps for speed.
But if there was a choice on what the standard terminology was for internet speeds, from speed tests and ISPs, I'd rather it was MBps.
It's like comparing how many oranges you have, but one person is counting in whole oranges and the other is counting in orange segments.