It just mean that Pancakeswap liquidity is already depleting most probably due to competition of other AMM exchange. This is the right thing to do if you don’t have funds anymore to continuously pay stakers with there passive. This will not gonna kill PCS because they are already established and the number one AMM exchange in BSC. Maybe you are just frustrated in the decreased of the reward. Moving in Biswap is a smart move if you are chasing high APR.