A few questions (concerning verification, staking,loans)

1. Does anyone know how long Binance keeps your verification/identification?
2. I've heard that staking+loaning on binance is essentially run by third parties, is staking/loaning through them still insured/protected or are you SoL when something happens on 'their' end?
3. And if for example you stake your ETH on Binance, can you add more ETH later on to your pool or is that crypto locked till it has run its course?
   

(Thanks for reading and pardon if this has been asked before, but I couldn't find anything concerning whether or not Binance actually keeps your ID or if they remove it once you're verified.)