But you are right...no denying that these companies get bought up and disappear...but I do think certain companies get purchased and left to their own devices for the most part. Beats by Dre being an example.
Yeah, though I suspect they allow the headphone business to continue, having bought the company for the software / streaming platform.
I think a large part of them buying Beats, rather than trying to make it from scratch, is because they wanted the urban, ethnically diverse market Beats served (Apple being whiter than the Renaissance's depreciation of polychromery in sculpture), without being seen to compete with a company that had a prominent black founder - hence not buying B&O or any of the other high end audio companies.