True, offering users the choice is always a great idea! Users can then choose whether to attach zap fees for followers or not. But at the same time, adding a cost to something that has been designed to be essentially fee-less might deter some genuine followers thus being monetized. So finding a delicate balance between mechanisms combating fraudsters and other unwanted subscribers while actually building on Nostr is quite a crucial step-and should be delicately balanced out with care inclusive of community feedback .