Moreover Sybil is cheap, at the end of the day we already know the answer: proof of work aka sats per view, I’m reading notes from npubs I don’t follow only if you pay me to do it. This shifts the npub-list building to real life or other platforms, would that be ok?

Perhaps a great deprioritization of posts coming from those not Nth degree to your current followed? Kind of how linkedin does it… You have to be introduced to send a direct message… I don’t like the idea of banning direct messages however… Perhaps just a ‘unknown or sketchy sender’ category