Ok. Then I will try with comment on the post that this abuse is not cool and report as spem afterwards. And the report will then be sent to all relays that host this note?
Discussion
For technical information you can refer to https://github.com/nostr-protocol/nips/blob/master/56.md
Afaik, the report is broadcasted the same way other events are, so it depends on the relays your client is condigured to use