It is so hard that a handful of opensource projects and 1x other companies solved it successfully (talking about the DB) and they bought most of the other tech instead of developing in-house. I am not sure which hard problem they are trying to solve but I am pretty sure that most of their offerings are overpriced. Oracle is here to stay as much as any other dinosaur from the past. They might be able to pivot to the cloud era (not too successfully yet) or they revenue is slowly going to decrease together with their significance.

https://en.wikipedia.org/wiki/Oracle_Corporation