This new feature, found in Google Calendar's settings, aims to allow users to prevent third-party apps from viewing their Google Calendar events, even if those apps have general calendar access.

When you give an app calendar permissions it can tap into Android’s Calendar Provider API to access schedule data that’s synced with your device. That could come from anything like Samsung ...

Google’s “Web Integrity” Android API could kill “alternative” media clients Web Integrity pivots to Android, could permanently kill YouTube Vanced-style apps.

Google Tasks entries were already a part of Google Calendar's website, but now they're integrated with the Calendar apps on Android and iOS as well.