Sounds like a free rider problem. It has to be a cheap enough solution that the majority of the population can join but it has to cost enough that it is a barrier so smammer can't afford to spam.. All while, you have to make it simple enough for the masses. That's where the relay problem comes into play. It's too confusing for the masses. I don't understand what half of these relay buttons do on Amethyst. I've seen the question asked multiple times but never seen it answered. I've signed up for a paid relay but not sure of the full benifits of that are.