Answer 2:No, you don't have to buy CRV separately or lock rewards. All you have to do to receive CRV rewards for liquidity providing is to stake your tokens in the Curve Gauge. This will allow you to earn rewards in the form of CRV tokens, which can then be used to purchase other tokens or to stake in other protocols.
Not sure what do you mean... You dont have to buy CRV separately or lock rewards. All you gotta do in order to receive CRV rewards for liquidity providing is to stake in the gauge.