Seems like the US didn’t enforce antitrust laws and allowed YouTube to grow into a monstrous monopoly, because they wanted Internet revenues to all flow into America rather than into a variety of companies, some of which might end up not being American if YouTube was split up. Seems like a pretty bad deal for literally everyone.
I think the damage to democracy is done by low interest rates (QE). US was lucky to not be affected by wars and hate for a long time, but they existed before tech companies, like Facebook, especially when the financial system was centralized and corrupt.