Disclaimer: I work at Google, but not on anything to do with search, and used DDG for my first year here out of habit. I have no inside info on search.
I don't find Google search to be bloated with ads. If I search for hotly competitive keywords then I do see ads, but the same is true where there is ad inventory on other sites, and when there isn't ad inventory that's not the true UX and it's only a matter of time until the ads arrive.
However, the majority of my searches are fact-finding, and I get facts, with no ads, or I don't even see the ads because I've got the answer before I get to them.
This is why I'd like to see a deep dive on this stuff, because the HN opinion is just not one that resonates with me at all at the moment.