Yes but Stackoverflow is a now mostly a graveyard of old closed questions, easily cached, I am only half joking. Most startup ideas today are a lot more intera

Yes but Stackoverflow is a now mostly a graveyard of old closed questions, easily cached, I am only half joking. Most startup ideas today are a lot more interactive, so a SO model with two DBs would probably not serve them well. Horizontal scaling is not only for ETL and I am uncertain in why you say that it needs many lawyers.