Regulating them to a pure marketplace is the best outcome we an hope for, i.e. require them to divest any product they sell in the marketplace. India took some steps in that direction last year. Why not in the US?
Because the US regulatory framework and enforcement has been chipped away at by corporate interests over the past 3 decades to the point of non-existence.
America went from filing >50 antitrust lawsuits in the 1970s to ~5 in the past 2 decades.