Thx Christel Tardif for your thoughts and feedback. What exactly do you mean by early adopters "selling" the idea? Selling to customers that the drink comes without straw or do you refer to something else.
As this is a multi sided model it is indeed very challenging to build value on both sides through high numbers of bars and site-visitors / customers. With such models the first months or even years are critical. So far I haven't come up with alternatives. How exactly would your partnership solution work? Thank you for any further input and thoughts that you might have in the upcoming days. Stephan

Thx for the Reminder Kate Rushton . Just completed the typeform and hopefully I find some time to create a journey map and reflect on some of Anne-Laure Fayard 's brilliant questions.

Thx Darren Yeo for your comments.
Exactly, the idea is that we award certain businesses with a certificate that represents participation in a plastic free movement and serves as a badge which can be also displayed digitally (like bcorporation)! Issuing the badge for a year or longer or shorter is certainly an important question. It shouldn't be easy to get unless you commit to banning straws in your bar/restaurant but of course you should be able to celebrate your success for some time.

Of course: it's important to test how important straws really are fro (perceived) quality. My feeling is that we use because we get it but this feeling needs some back up / testing.

Do you have a restaurant, café, bar or any other business of that sort?