We are back in the Robber Baron era. The difference is, the 19th century variety at least pretended to have morals. The current crop has none and doesn’t even pretend.
The other difference is that the “progressive left” opposed the original Robber Barons. Seems pretty clear our present-day left is perfectly cozy with gigantic businesses.
Standard Oil comes to mind. Kill off your competition by any means necessary.
Did not work out well for Standard but John D. Rockefeller made more money from the breakup than he could ever imagine.