Makes me wonder if you can even build something like this, if decentralized systems must spend more time filtering junk, on a system which makes it easy to send

Makes me wonder if you can even build something like this, if decentralized systems must spend more time filtering junk, on a system which makes it easy to send it, it will always be too easy for malevolent actors to takedown. Unless you can incur a significant cost to these activities, e.g. requiring social capital (burning social capital with e.g. hate/disinformation), or physical (e.g. access requires boxes which cost some small fee and can be blacklisted)... Perhaps some of mastodon inefficient behavior can be leveraged here?