Counterpoint: Beats' revenue far eclipses that of Dark Sky. Apple recognized that it is its own cash-cow of a beast, and purchased them both for the revenue and because they could ensure that the product is more closely integrated with Apple products.
Shazam, I can only take a stab at this one. Perhaps it's a name thing? "Nobody", eg the public at large (so, set aside the passionate Dark Sky love you see in this thread), gives a shit about weather apps, at least on a broad scale. The default option is fine. You don't say, "Dark Sky it", you say, "Check the weather". When you wanna know what's playing, most people say, "Shazam it". Apple and Android integration of this into Siri/search came way later, far after "Shazam it" became the standard phrase. There's no "obvious" replacement, like there is with the default weather app.
Shazam, I can only take a stab at this one. Perhaps it's a name thing? "Nobody", eg the public at large (so, set aside the passionate Dark Sky love you see in this thread), gives a shit about weather apps, at least on a broad scale. The default option is fine. You don't say, "Dark Sky it", you say, "Check the weather". When you wanna know what's playing, most people say, "Shazam it". Apple and Android integration of this into Siri/search came way later, far after "Shazam it" became the standard phrase. There's no "obvious" replacement, like there is with the default weather app.