This one always comes up a lot for some reason (I really don't understand what point is being made), but I'll point out that maps was actually acquired. But, it's been so long since that it's been a) thoroughly ship of theseus-ed such that I'd be surprised if there's more than minor fragments of the original codebase remaining and b) sprouted large new features that are under the 'maps' umbrella but could easily be standalone apps in their own right (example: public transit support in google maps; there's a whole marketplace of apps that just do that).

Similarly for docs, android, etc - maybe they were started with an acquisition but given the amount of change and work done on top of that: so what?

I dunno, Search seems pretty successful.

> almost everything else they acquired.

Android was neither successful nor much like what became successful when they acquired it.