The fee revenues come from its users, they pay when they use an application built on Ethereum to settle the transaction. Most of the applications, specially the

The fee revenues come from its users, they pay when they use an application built on Ethereum to settle the transaction. Most of the applications, specially the most successful ones, the ones that spend the most ETH, are financial in nature at the moment. I suspect this is likely always going to be the case, as blockspace is a scarce resource only the most added value applications can compete for it. Non-financial applications will exist in the multiple L2s that are being built on top, these involve various cryptographic proofs to settle batches of transactions onto the L1. So financial applications and L2 proof verifiers will likely dominate the use of Ethereum in the future.