Cashu mints are a solution for the lack of privacy associated with the use of custodial lightning wallets. The LN itself attempts to solve the lack of privacy of onchain BTC, high fees for low value onchain transactions, and the high latency. Monero attemps to improve its imperfect privacy if full chain membership proofs, rather than with L2 solutions. Due to its limited adoption the fees have not risen enough to be a problem. The problem of high latency of XMR remains unsolved.