That case could still be appealed and overruled. And then it could go to the Supreme Court, which would likely take years to resolve. Better to be safe than sorry, rather than hope that the case will stand.
It also doesn't fix the problem where a number of contractors sue you even if they might be wrong. It could very easily be a class action lawsuit like the one that cost Microsoft a lot of money. They could use those rules as a start and then throw a few other things together such that Google thinks it might have a problem in court and wants to settle rather than risk getting sued by every single contractor.
I can guarantee you this made more people adverse to the cause than for it. They did everything wrong, and many of the people who might have had a chance at trying to change things are out of Google and will not be able to do anything.
It's also likely that people who saw this might now not want to be involved at all for fear of losing their job.
This action likely did nothing but make it less likely that anything will change, and been the absolute worst way to attempt to persuade people.
But that assumes that Google would settle. Without that happening, you are looking at years before getting a result, thousands of dollars of attorney fees and a high likelihood that if they lost they would appeal.
This might be more of an emotional lawsuit than a logical one.
It also doesn't fix the problem where a number of contractors sue you even if they might be wrong. It could very easily be a class action lawsuit like the one that cost Microsoft a lot of money. They could use those rules as a start and then throw a few other things together such that Google thinks it might have a problem in court and wants to settle rather than risk getting sued by every single contractor.