Number of reasons to do this…
#1 we don’t want UNI being held on centralized exchanges because it allows CZ to vote for us which is obviously not good. UNI liquidity should stay on Uniswap
#2 Current UNI inflation penalizes UNI holders at the expense of providers of liquidity in the other pairs. Why are we punishing holders of the governance token? They should at least get same rewards, if not more than the other pools. If we don’t do this bots will continue to farm and dump using market orders, making the UNI market more chaotic than it needs to be.
#3 Instead of farmer bots instantly dumping all of their UNI (sometimes not even on our exchange!), they might direct a portion of it back into the UNI/ETH pool.