The part of Fiat that is wrong is usury. While the part of bitcoin that sounds wrong to me is mining, new bitcoins are generated out of math in a game-like process (like gambling) that is making users earn without giving a product or a service. Fiat and bitcoin are both okay if used for trade purposes without the involvement of usury or mining (gambling and playing to earn more bitcoins).
Discussion
I do disagree that miners do not provide a service.
By selecting transactions in blocks, they create a chronological order that is important to avoid double spend.
Adding blocks to the chain also finalize the settlement of those transactions.
I’m not a miner (otherwise I could’ve been cool). Anyways, selecting and putting in order is more like being part of the game, not offering a service tho.