I suspect that this is a consequence of the above problem. Something that's pretty successful and growing at a pretty good clip is not a giant spigot of money,

I suspect that this is a consequence of the above problem. Something that's pretty successful and growing at a pretty good clip is not a giant spigot of money, and therefore it's effectively useless to Google. Maintaining it requires programmers that could be better put to searching for the next spigot.