Seriously, that's how America works? Somehow that doesn't surprise me.
In most of the rest of the world it doesn't work that way.
Firstly things are typically not allowed to be sold unless they can be shown to be reasonably safe - which this study was invaluable for.
But when suing you need actual damages to claim for and you have to show direct harm. There isn't such a thing as punitive damages. The model is to try to prevent bad things from being sold up front rather than assume firms won't do it because of the punitive damages that will be awarded once someone is hurt.
Cancer is particularly difficult to attribute to a particular source.
Technically exemplary damages do exist in the UK but they exist in very narrow circumstances.
Mesothelioma, for example, is extremely rare other than due to asbestos exposure. It is not caused by smoking. This makes it easier to sue successfully (outside of the US I guess) for damages.
In most of the world a study like this is not a defence against damages, but would tend to lead to a presumption that glyphospate was safe to use. But that applies anyway because it's regulated. More likely than not the path to damages would be against someone who used it outside the recommended ways.
Withdrawing this study is unlikely to have any impact on the probability of suing for damages due to glyphosphate exposure or have any claim against Monsanto.