I agree with this. For example, Sun was sold for $5.6B in 2009. [1] While Skype was sold for $8.5B in 2011 [2].
Sun had Solaris, Java, SPARC, and MySQL. Skype was a chat tool.
Even today many popular databases find it hard to get billion-dollar valuations, while multiple Social Companies has done it.
The market doesn't care about core CS. It cares about monetary gains.
[1] https://en.wikipedia.org/wiki/Sun_acquisition_by_Oracle [2] https://en.wikipedia.org/wiki/Skype