To my knowledge all apps are sandboxed, and you can chose to not grant permissions such as network access. So you can keep your calendar app from spying on you and phoning home.

For the calendar specifically, you could use something like DAVx5 to sync your calendar onto your phone. Then, Google Calendar would only be displaying the calendar that’s already sync’d to your phone, and you could revoke network permissions from Google Calendar.

Otherwise, for a program that transmits a bunch of data whenever it connects to the internet you don’t have a way to finely control that.

I haven’t use a DNS filter on GrapheneOS before, but that might be able to block specific connections.

In terms of app sandboxing, I don't think GrapheneOS is doing much to improve privacy, besides sensor and network premission. https://grapheneos.org/features#improved-sandboxing detailed its improvement to sandboxing, but it is more for malicious app, but not for data hungry app, like google product.

In general, an app can only track your behavior within the app besides the premissions you granted (Play service provides an global advertizing ID, which can also be used for tracking, but you can disable it or reset it at any time). You can check these premissions on the premission tab, and the three dots on the top right will show you all premissions.

Tutanota, aka Tuta, don't rape your schedule, snitch on your exploitative overpriced Mad Hatter ma/eth OS w/ grap-six's one sex location of Mars doing same and "Killing Ma" but be real. That's just sleeping. He'll be back when the next one gets there and does that again.

Stinky Felon hair/hare/air chair cheating history to do it "different." They see not through the obvious and fail to see outside the key.

The house sign board is not protecting the humanity it is not hiding the murderous rape that you are not to be understanjnd that you cannot actually be understanding what is actually happening. It's a show. The prelude to a nice array of options like anything you've pulled off TV and then some if you got that into something of a reference of point set.

It's not what you think it is. I'm an Aghora of my nick's trad. I do what they do to everyone else, to them like Thanos. I can explain why Than OS says "I cannot care about anyone to care avout everyine." It is but the literal left wing to a right hand that got off the charts by design and does the opposite of mirroring with binary math language of pertinance, navigation four multiplying dimensions joined by the other quad that's mirror of our 4. One is time (total 2), and three seem to be be physical but practically nothing we thought these worda mean what it seems to say and execute.

Anyway, they encrypt.