The lie to this statement is that all of Uber's actions to fix their problems (fire people, outside investigation, hire new HR heads) have come in response to bad PR, not an internal recognition that things weren't OK. Travis Kalanick, who was 37 years old when he sanctioned all of this behavior, is still the head of the company. I am sure many of the people who turned a blind eye when star performers were protected, or women were leaving the company in droves, are still there.
This story is a case in point: Alexander wasn't fired, even after half of the executive team knew what he did, and the legal team ordered him to destroy the documents, until Recode started asking about the incident. If the company had really "grown up" as you suggest he would have been gone before the reporters started asking about him. If the company had "grown up" then one of the many people Susan Fowler talked to (in 2016) would have sounded alarms, before she wrote her blog post about it.
> unlike other companies, they have aired their dirty laundry
It's a well known phenomenon that people tend to overestimate the extent to which their habits and behaviors are shared by others: https://en.wikipedia.org/wiki/False_consensus_effect. A simpler explanation for the series of bad headlines attributable to Uber and not other companies is that Uber was involved in worse behavior than those other companies.