Self defined failure
Solaris/SPARC and Sun were seeing some of it's biggest interest and growth towards acceptance when they did OpenSolaris. When Oracle took over, closed it down, closed down links to traditional high spending markets and then refused to work with external software vendors that produced market leading products that even slightly clashed with what Oracle had in-houose, it was the end.
They dropped ranges for telecommunications systems (DC power) claiming special requirements - whereas the competition had no issues putting DC power supplies into off the shelf systems.
The focus became big iron for Oracle only workloads. If you weren't buying M5/6/7 or Exa, you were a nobody.
Then they dropped the blades.
Why would I listen and care about Oracle Cloud?