The plastic producers were the ones pushing the grift and controlling the narrative/studies, just like what was done with fossil fuels and climate change (certainly a trend here with the oil industry).
Additionally, they’re the ones that directly benefitted the most so it makes sense to go after their fraudulent gains.
I’m all for being critical of municipalities and elected officials, but the solution is not to bankrupt cities or state/federal funds through litigation. The focus should be on the producers. Go to the top of the chain/follow the money.
Edit: To your point about news conglomerates, that seems more viable and they certainly need better incentives and regulation.