Google seems to have problem of "you won't get promotion/raise if you don't work on something new" so they are not interested by services that just work and provide tidy little constant revenue
To some extent it's true on a macro scale, but it's a trope to say this is exclusively the case. I would say it is easier to paint the picture for promotion by working on new things but not by a large amount. The vast majority of folks at Google work on maintenance, as would be expected.
