[abhilash0505]

One of the reasons for it is actually Marketing. If I were to provide an 8Mbps connection, an average person would not know the fact that 8b = 1B. From an ISP view, 8Mbps seems a better speed than 1MBps to an average non-tech customer.

[saddestcatever]

My assumption: No ISP wants to be the first to make the transition to using MBps. And thus, legacy metrics are used forever.