Unexplained permission request on load

When I load Margin.at, I see a permission request to access other apps and services.

Why is this being requested? What is it for?

Generally I prefer that permissions request be made with some kind of context or information. This just pops up every time I click the site. I don't want to say block, because maybe there is something neat and cool here. But I don't want to say allow, because that sounds like a very broad permission to give.

I feel like there should be a better on-ramp/funnel to whatever is happening here, before permission is requested.