I don’t think that someone is talking about using BTC or ETH. They’re literally unusable to make purchases (multiple minute settling times and the high costs you mentioned) but any other functional L1 would work. Algorand for examply has ~3second block times with instant finality and costs a fraction of a fraction of a cent to use the network. Those fees couple be subsidised they’re so low. They’re significantly lower than a rail like Visa or MasterCard. But you’re right, implementing it so anyone can easily use and access it is key.
Just finished it for the first time, have been telling all my friends about it. There’s something about how messy the lore is. Some collectables don’t tell you anything except shape the atmosphere of the oldest house, which is so nice. It was so beautiful too. Really good low flying game. I’m gonna definitely check out some other titles by this studio. I’ve played AW 1 and loved the connections to that. Just a real surprising 10/10 for me.