Why does my Ethereum show as WETH?

WETH is ether in ERC-20 form. Ether is the native currency of its network and does not follow the token standard that exchanges and apps expect, so it is "wrapped" into WETH to make it tradable. There is no company in the middle: wrapping is done by a public contract, one WETH is always one ETH, and unwrapping is open to anyone. Moneda shows it as "ETH" by default because that is what it is; turn on "Wrapped token tickers" in Settings > App settings to see WETH.