Zapping use the lightning network of bitcoin, which means that only the sender node know the recipient. Other nodes in beetwens who route the payment are aware only of the previous and the next node of the full path, bht they cant know who is the sender and the recipient. Zaps have already an high degree of privacy

Also, Monero doesn't have his own second layer protocol for scaling the transaction throughput like bitcoin, so it will be anti-economic implement fast and small payment