Some good thoughts. Perhaps a similar approach is staked Bitcoin (why similar? It adds a cost) that doesn’t move could be used. However there would then be a market selling UTXOs of hodlers. Even renting this would be 10-100x cheaper than buying that Bitcoin. The issue with web of trust is that your weakest link is always the easiest route. Computers don’t care if it takes months to progress. And the next issue is even closed/small highly verified networks don’t cater for the wider audience social media we largely use today. What if it was your grandma who trusted the bad actor? Bye grandma? The next issue is just like world coin using eye balls to ‘verify humans’, people will sell their human verification - or identities of the dead get to live again.