Why do I have to pay a network fee to withdraw? Where does this fee go? How much is this fee?
A network fee is necessary in order to have your transaction processed by the decentralized cryptocurrency network. This fee goes to cryptocurrency miners, not GCP, as an incentive to secure the network and include your transaction in a block.
There are a number of network-dependent factors that are used to calculate a withdrawal fee, making it difficult to predict these fees before attempting to withdraw.