Here's a well-sourced rebuttal to your statement that privatization benefits revenues: https://youtu.be/DlTq8DbRs4k?t=591

TL;DW revenues and passenger numbers are demonstrably lower with privatization than when nationalized. Unlike other industries, the UK's franchise privatization model is not subjected to free market forces, allowing rail companies to win contracts by underbidding only to fail to meet their targets.