you get them if/when a miner mines them but (1) you *didn't* propagate them to miners (2) you *did* reduce that miner's block propagation speed those are two benefits you lose by opting for Bitcoin Core's mempool software

I agree with you two points above. But, unfortunately, it's is those miners with stricter filters who are disadvantaged by reduced block propagation speed 😓

You just reject them and don't store them in your mempool, not filling up your hd and providing free storage for that spam. Like on your mailserver.