Marketing for the most part. Bigger number sounds better for speeds so things are advertised with the bigger number. They don’t expect grandma to know the difference between bit and byte and grandma of course is gonna take the speed that’s 8 times bigger.

>taken out of the economy instantly

They wouldn’t be. Paying debts with printed money by definition is injecting money into the economy. You would “take it out” by a central bank exchanging it for the same value in cash, created by printing new cash.

Anyways this idea has been floated, particularly in 2013. Ultimately the problem is no one knows what would happen. Classical economics says we would see a mass loss of faith in the currency alongside the natural inflation added supply creates. Issue is no one knows anything about economics anymore since classical economics has been shown over this past century to not be entirely correct and it’s a bit of a fear of the unknown at this point. I would imagine we would see significant inflation still, but how much is something only god knows.

The coin itself is not important. No one realistically is going to use it to pay anything. The only reason the coin is important is that it essentially acts as a “voucher” to be exchanged for a truckload of regular cash if by no one else then the central bank. In the end the effect is just a slightly more ceremonial way of printing a truckload of Benjamins.