In PoS system, tokens that user hold will not move out of the wallet when staked. The fact that the token itself does not move out of the wallet shows the safety of staking. As long as the user is using a decentralized wallet like Moonstake Mobile Wallet or Web Wallet, even if the wallet operator stops the operation, the wallet can be recovered using another wallet provider as long as the user holds the Backup Pass Phrase. Moreover, even if the validator terminates the operation, since the user is not transfering the token itself to the validator, staked assets will also not be lost from your wallet.