It is also worth remembering that once a startup migrates past initial growth and becomes a solid "big company" (e.g. Uber, AirBnB, and others mentioned here) t

It is also worth remembering that once a startup migrates past initial growth and becomes a solid "big company" (e.g. Uber, AirBnB, and others mentioned here) they will often have Oracle in a few odd spots in the org where there are specific apps that may be best-in-class for their specific purpose but are also tied to Oracle as the DBMS. If HR and Finance are orgs run by different people I would bet that both of the have an Oracle DB or two hidden in the back somewhere...