Pretty much all cryptocurrencies right now follow the same model as Bitcoin, and require similar fees when congestion increases. (See Ethereum's recent fee spik

Pretty much all cryptocurrencies right now follow the same model as Bitcoin, and require similar fees when congestion increases. (See Ethereum's recent fee spike when CryptoKitties took off.) The Bitcoin and Ethereum communities are both seriously exploring and working on solutions like off-chain transactions to solve this issue.