What ads does Chrome make money from?

This makes sense, but it is made even more nonsensical by the fact that the DOJ is also separately saying traffic aquisition deals are anticompetitive as well.

Google makes money from ads by having control of Chrome. I don't see how that would continue if it's spun out. I'm not aware of any ads in Chrome itself (but I've been using FF for years, so what do I know). And Chrome controlling the default search engine is exactly why they want it spun out from Google, so if the result was simply that it makes money by defaulting to a different search engine, that would be an absurd, pointless result.

Chrome has ads? Or do you just mean any browser that defaults omnibox searches to google.com? a.k.a. firefox, safari, opera, chrome, etc

This is good guess unfortunately. However, there are second order effects as we've seen with X that will drive people to Firefox so this could end up being a good thing.