I doubt it has anything to do with them not wanting you to leave google, more that there isn't anything in it for them. I suspect they thought at one point tha

I doubt it has anything to do with them not wanting you to leave google, more that there isn't anything in it for them. I suspect they thought at one point that this would be a freemium product and people would upgrade to the white-label version, but maybe they weren't, or not enough. Now, if somebody wants google on their site, they have to pay google, or force visitors to go to google.com, where google will show them ads.