Yes. On client level, like Amethyst, it makes the notes hidden. In relay level, depends on the relay owner, some relay like nostr.mom currently has spam filter and also periodically review spam report to filter and delete the spam content from the relay. Cc #[2]
Discussion
nostr.mom does drop if spam coming from an IP is too much. For reports, I am doing some more thinking. We should not upset decentralized/trustless people or protocols by doing some 'web of trust' that may start at a centralized point.