Better logo than any competition.
Also the attempt to make running a node have lower overhead than competitors also is an attempt to make it “fairer.” Be your own bank works best if you can actually run the bank software yourself. And regarding the fairness of the distribution, it is objectively fairer by a bunch of metrics. The window to hoard all your bitcoin was very short before it started becoming too expensive to buy many of, this is hypothetically solved by grin. This means more people can “get bags” more easily. We don’t know yet if this is better game theory wise, but it is definitely going to give people more time to find out about grin and start messing with it before a grin is worth a bunch of money.
Regarding proving transactions: this is the same as cash. A merchant cannot prove you paid them in cash except by keeping the best records they can. This is in many ways a feature of grin and not a bug. It’s also trivially easy to use other methods (like a self-hosted grinbox.io instance) if you are a business and want to incorporate some proof of tx. There is ongoing discussion on how to accomplish this with minimal tradeoffs: https://github.com/mimblewimble/grin/issues/2652
TMGOX.com just implemented grin payments. It would not work if it was not possible to wait to confirm that a transaction ocurred and blocks have been mined on top of the transaction block. (thanks to hashmap and cycle42).
Intended market/use case is the same as bitcoin/monero or cash, except that it is based on the lessons people have learned in the past years about how to launch a blockchain, and it does some super interesting new math to keep things private and lightweight. We are so early in the history of these non-sovreign currencies there’s no way to say who will win. Bitcoin could completely disappear in 50 years, and looking at the number of companies that were the first mover in their niche only to be replaced by better products, it seems likely bitcoin will be more historical than practical. There is no reason not to create diversity of experiments and see who fares best, for the sake of everyone. We can learn in these early days and someday maybe actually succeed in the goals of non-sovreign global electronic cash on a large scale.
Why are there more than one type of bird? Why do countries not all just use the Euro across the globe?