Why is ETH so expensive to swap?

Could you please explain why the process of swapping ETH tends to be quite costly? I've noticed that compared to other cryptocurrencies, the fees associated with ETH swaps seem significantly higher. Is this due to the complexity of the Ethereum network? Or is it because of the high demand for ETH transactions? Could you also elaborate on any potential solutions that might help reduce these costs in the future? I'm curious to understand the reasons behind this phenomenon and how it might be addressed.