It's extra work for website owners to build/test/maintain opt-out functionality. Have you considered offering a pre-built opt in/out widget which can be re-styled and integrated easily?
Or you could even just provide website owners with a "global opt-out" URL that they can stick in their footer.
We don't want anyone on the platform who isn't aware/comfortable with it. Our instructions to the websites (when they join) are to create a link to the opt out page. I supposed it could be a direct opt out
Or you could even just provide website owners with a "global opt-out" URL that they can stick in their footer.