When a large search engine deranks spam websites, the spam websites complain! Loudly! With Google they have a big juicy target with lots of competing ventures for an antitrust case; no such luck for Kagi or DDG.
0: for context, us doj does not take antitrust action against companies simply for market dominance; it requires market dominance plus an anticompetitive action. However, they don’t like monopolies, so effectively any pretext can be used — see the apple lawsuit or the 90s ms lawsuits for how little it takes.
https://en.m.wikipedia.org/wiki/Antitrust_cases_against_Goog...