Zaps (public display of amt sent/received) are dangerous and a dream-come-true for scammers. Because wash-zaps are easy, 3rd party cannot detect fake zaps from real.

Likes are superficial, but nostr is an open protocol and they can mean anything.

For example, a like can trigger a Shadowy LN Tip: https://oak-node.net/doc/trunk/doc/ons/ons-3.md

In this case, they mean real hard sats, visible only be sender and receiver. No "wash-sending" possible. No algo to influence. No vanity games.