Once staking in Eth2 begins, you will NOT be able to withdraw your deposits until the Ethereum Foundation finishes the Ethereum 2.0 migration, estimated to deliver in 2021.
Until that time, your ETH is as safe as possible in the protocol. The only place ETH can be sent to is the Eth2 deposit contract and no one can move ETH away from the SharedStaking contract, including the team.
You should research the Eth2 migration plan to understand what is custodial & non-custodial service and use StaaS solutions at your own risk. A five percent fee may be added to your validator reward if you unwrap your vETH2. SharedStake plans to hold withdrawal keys in multisig contracts to reduce perceived custodial risk. Although we plan to use the best security & audit teams available, SharedStake cannot guarantee their efficacy.