Are you talking about the spam filters that are required for email, or the spam filters that are required for the exact same reasons with ActivityPub? https://

Are you talking about the spam filters that are required for email, or the spam filters that are required for the exact same reasons with ActivityPub? https://www.w3.org/TR/activitypub/#security-spam https://www.w3.org/TR/activitypub/#security-spam "Spam is a problem in any network, perhaps especially so in federated networks. While no specific mechanism for combating spam is provided in ActivityPub, it is recommended that servers filter incoming content both by local untrusted users and any remote users through some sort of spam filter."