How Does PPLNS Effectively Deter Miners from “Pool Hopping” or Short-Term Mining?

PPLNS deters pool hopping because a miner's payout is based on the shares submitted over a moving window of the last N shares. A miner who quickly joins and leaves (hops) will have submitted a high proportion of shares in a round but will only be paid a small fraction of the next block's reward, as their shares will quickly fall out of the PPLNS window.

This reduces the incentive for short-term, opportunistic mining.