Normally, after providing liquidity to a pool on PCS and receiving LP tokens, you can stake those to earn CAKE. The CAKE rewards incentivize people to add liquidity to the PSC pools but it takes a little more time and effort from the farmers. That CAKE can be converted to more LP tokens for compounding returns, or can be staked in pools to earn other tokens. PCS mostly doesn’t have auto-compounding pools or farms, so funds have to be manually converted and restaked.