I dunno if this is exactly the point, (not prevent them from profiting on whatever sub businesses get created), but with Standard Oil you could say that splitting it up didn’t do much in the long term. See: https://www.visualcapitalist.com/chart-evolution-standard-oi...
I'm not sure I can come to the same conclusion from that page. 100 years later 4 major branches are still competing with the largest of those being <50% the value of the group as a whole seems like an ENORMOUS difference in competition compared to 100 more years of a Standard Oil monopoly. That's not even counting the dozens of minor company spin offs.
Even if they all merged into 1 again in the near future I'd still count that breakup as having massive long lasting impact.
