You seem to believe a description like that is a recommendation, but it might be the opposite. Any corporation is a place where Not-Invented-Here virus spreads rapidly, because a) there are numerous problems and edge cases that develop at large scale; b) there is manpower to charge at them; c) there are incentives to do just so, and appear as definitely hard working to the management. That aura even spreads externally, in particular, to this conversation we have. If something is made by a hip company, it's a gods' gift to mortals, if it's from uncool place, it's definitely a rusty tech working on punch cards. (I am sure there exist at least one example in which the same person or team did both.)

Of course, they must have had valid reasons to use LevelDB for some components in Chrome. It seems that Minecraft-like world generating games are also a good use case for it. What I'm saying is that Google doing something does not automatically mean you need to do the same at all.