Clients have an easier time because we only have one user. We can delete anything that specific user doesn't like. So, we don't need much to make this work. Relays on the other hand, have the full contact list of everyone and can build much smarter filters based on WoT. I don't think there is any way around it. It's WoT or cease to exist because no one will use you. And when I mean WoT, I mean pagerank-like graph analysis of pubkeys, not the shallow follows of follows stuff.