Yes, there are Bitcoin network fees when withdrawing Bitcoin from your River account. These network fees are small amounts of Bitcoin given to incentivize Bitcoin miners to confirm Bitcoin transactions on the network. River is not the beneficiary of the network fee.
It is important to note that these fees may be higher during periods of high transaction volume in the Bitcoin network. We calculate the network fee to target confirmation within 4 blocks (~40 minutes) of the withdrawal.
The Bitcoin network fee you pay will be explicitly stated throughout the withdrawal process in the pages below.