So now there will be blockchain-specific mail deliverability providers? Seems like a straightforward enough business. 21.co/Earn (the pivot to bounty-paid spa

So now there will be blockchain-specific mail deliverability providers? Seems like a straightforward enough business. 21.co/Earn (the pivot to bounty-paid spam inbox) is interesting, but not a great implementation of the "email anti-botherance bond" idea from the mid-1990s.