I'm on Amethyst so didn't get the option of testing it. I also didn't notice any like buttons missing. I think I was able to like the posts of zap only accounts. I assume they didn't see them. Not sure if others could see them.

The issue I see with zaps is that a 1000 sat zap costs more to some than others. For someone on $2 a day, 1000 sats is a couple of hours work. For someone else, it's insignificant. For the reciecer of a pseudo anonymous zap, they appear the same. If we want nostr to break down barriers, we need to think about how to signal value appropriately.