There's a concept here I can't grasp So let's say ... @curvefi

Answer: When you mint crvUSD with 1ETH, you are essentially providing liquidity to the crvUSD/ETH pool. This means that when someone wants to trade ETH for crvUSD, they can do so by purchasing it from the pool, and when someone wants to trade crvUSD for ETH, they can do so by selling it to the pool. This liquidity is provided by the users who mint crvUSD in exchange for ETH, and the crvUSD is created on demand when needed for ETH to be swapped back to it.

Basically someone will need to sell crvUSD to the pool