If they're doing that, sure. I'm not sure it's that sophisticated. Last I heard they sourced different engines for different types of things/geographies not n

If they're doing that, sure. I'm not sure it's that sophisticated. Last I heard they sourced different engines for different types of things/geographies not necessarily mixing results from multiple sources for a single query. But this is all based on things I've read in passing rather than any serious research/insider knowledge.