A lifetime of avoided plastic straws will then be instantly cancelled out due to the absolute mountains of plastic waste necessary to provide healthcare treatment. Oh, and you also gave the person cancer or ruined their health.
You can already see the early signs - not that there will be political or media will to admit that their moronic approach is moronic:
https://cen.acs.org/environment/persistent-pollutants/Biodeg...
https://www.foodpackagingforum.org/news/contamination-found-...
https://www.sciencedirect.com/science/article/abs/pii/S00456...
And I'm only talking about the unnecessary disease caused in humans, not to mention what will probably be the environmental impact of adding new forms of chemical contamination to the ecosystem, some of which are of the with-us-for-a-long-ass-time variety. Unlike plastic straws, we are adding this in a dissolvable medium, which also seems like a particularly bad idea.
I do think the metal straws are a good idea though, they're just incredibly hard to clean. And of course, if you care about this stuff you should be avoiding all take out and disposable cutlery/tableware.