The plastic straw thing is not to make an impact on the environment, it was chosen to make an impact on everyone's life.
Yes, we could do something bigger, but people won't notice because they can't see the effect in their day to day life.
Ban plastic straws though and EVERYONE notices and talks about it constantly everywhere. And if even one person starts using less plastic because of that, it was a success.
If you're "making an impact on everyone's life" in the form of making their lives more annoying and inconvenient, those people are going to resent you and the cause for which you inconvenienced them.
I can buy not relying on the first order impacts of banning plastic straws for the coat-benefit analysis, but relying on second-order effects doesn’t mean you get to toss out cost-benefit altogether.
It's the same story with trying to get rid of plastic straws.
In both cases, I don't want to dismiss the problem - it's just that there are bigger fish to fry to make a much large impact to the bottom line of plastic pollution.
Now, after reading through the "Our Story" of Podswap's website, I can see that the real selling point is: "Our batteries keep dying prematurely, and we don't want to fork over the cash for a whole new pair."
Recycling is great - keep it as a value proposition, but it shouldn't be the main marketing push here.