While it likely is spam for the majority of users, I imagine the mods are looking at de-federating an instance that fulfills a specific need for a small number (keeping alien.top users updated on reddit). Because of that, it will likely have a bit of push back to de-federate entirely vs. a request to create the ability to block users/platforms. Think of it like newsletters, we need the ability to unsubscribe/block them, but we shouldn’t necessarily ban them outright.