So your theoretical (straw man) user cares enough to not want their email in the hands of a third party service provider, but is unwilling to run their own serv

So your theoretical (straw man) user cares enough to not want their email in the hands of a third party service provider, but is unwilling to run their own service? Maybe this user should deliver their messages by hand directly to the recipient, because their demands are unrealistic. Self-hosted services are a significant step forward from the corporate trap of the 2000s. Offering paid hosting plans is the most logical, sustainable revenue source for the companies writing this software.