The "consumer welfare" standard is a fairly recent (1980s) reinterpretation, and the switch to it happened because of large business lobbying. The original intent of American trust-busting laws was very much to prevent capturing so much market share that competition becomes irrelevant.

https://promarket.org/2019/09/05/how-robert-bork-fathered-th...

And that original interpretation was what worked on the original monopolies (oil etc). The sooner we get back to that, the better.