This makes me 😭
UPDATE: Thanks @nekusoul@lemmy.nekusoul.de for this update: The issue has now been commented on and was closed by the maintainer, where they explained why those blocks would be nonsense. But it appears the OP wants to still talk with maintainer privately about it.
They do lots. They open images and other attachments on their servers so they can’t be used to track you and filter tracking links when possible.
Okey, that sounds super nice. I might just switch over my email as well to them, not just use them for their calendar.