Why are Americans only now talking about an oligarchy in America?

With Trump coming into office I’m seeing a lot of people say “an oligarchy is forming in America” but haven’t rich people in America had massive influence over the government for years now? Bribery, you call it lobbying of elected politicians is legal up to any amount. During elections you talk more about how much money a candidate has than their policies. You top rate of income tax hasn’t been above 40% since the 80s. Workers rights in America are a lot less than other countries.

Bernie Sanders has been talking about this for decades but why are people only talking about it now?