Yes. But it's not just the relay list, the `pzap` (encrypted zap content afaik) is rather big, also for short zap comments (maybe because of the padding?)

https://sourcegraph.com/github.com/vitorpamplona/amethyst/-/blob/quartz/src/main/java/com/vitorpamplona/quartz/events/LnZapRequestEvent.kt?L192 

 That’s not part of the spec afaik 

 Yeah, also couldn't find any specs. Seems to work similar to NIP-04 DMs though...