And I'd say that a significant portion of the remaining 16% is a byproduct of platforms for selling ads (e.g. Android) or just monetizing infrastructure Google

And I'd say that a significant portion of the remaining 16% is a byproduct of platforms for selling ads (e.g. Android) or just monetizing infrastructure Google had anyhow to serve ad related services (GCS, Google Drive). The one thing coming to mind which is not designed to boost advertising is their Pixel line (after they killed the rest of their hardware, of course) but even that is not as much of a standalone activity as it is a way to effectively steer the future of the Android ecosystem. Ask yourself this: Which Google products or services would have justification as standalone P&L units, without collecting user data and sending it to the mothership? Not too many.