Average users are not the only people that matter, despite what Robert Bork wants you to think.

What is wrong is the concentration of power within a company answerable only to shareholders. Even democratically elected governments need to be heavily scrutinized for abuses of power.

You still haven’t articulated what is wrong.

Corporations are answerable to their customers, their shareholders, and the law.

Your premise that they are only answerable to their shareholders is simply false.

But regardless - you have articulated no catastrophe for society.

All you have stated is an ideology about power itself being bad.

If you break up all the big US companies, there are plenty of big companies outside the US who will happily take their business and power.