[Illniyar]

A lot of people will.

But there's also strong education regarding system prompts. Users know when an app is asking for extra permissions (which this is basically the same of). Those people who care about what permissions apps have will know what to click.

Those who don't care, that's the most you can do. Besides even Facebook estimate that only 10-30% will click allow. I'm not sure if you can ask for more at this point.

[MonAlternatiu]

It would be awesome if the users were forced to navigate a settings menu, find the app on a list of apps, and manually enable the option.

One can only dream.