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The free $30 worth of DFI is put into staking that can earn daily interest but this $30 cannot be taken out and it is locked for 180 days. This is probably to avoid people from selling this free reward after getting it. Cake Defi managed to get partners that offers guaranteed returns for putting cryptocurrency into its lapis service. Lapis service is a monthly subscription. Cake Defi has total of 3 different services - staking, liquidity mining and lapis service. You can find out more from its website. I think it would be clearer there. No obligation to join but it can be for your Defi knowledge. If you are really new to Defi, I would suggest not to get involved in liquidity mining(yield farming) as our initial investment may change due to the price change of tokens that many called it impermanent loss. Most staking services are supposed to be safer as long as the staking pools do not suddenly close down. 😁