Zap is an optional feature for your followers who are on Nostr. For non-nostr followers other tipping methods are available. I think it shows that applications built on Nostr are ready for prime time and can not only compete with their Web2 counterpart in every respect but can offer additional features too! One needs to be on Nostr to use traditional nostr clients. Favvy pages on the other hand can be shared with anyone! I think this will help onboard new users to Nostr