> Notice that "ends" in "end-to-end" are users, not applications.
That's not right. First, it's technically an impossible, since users can't do encryption themselves - it's the application that does it. That's where the e2ee boundary is.
Second, we've got e2ee communication between non-user entities as well. There's are servers using for example zerotier which communicate e2ee through other nodes. Third, applications can definitely send the data to other parties automatically. WhatsApp executing backups as configured does not make it not e2ee.
That's not right. First, it's technically an impossible, since users can't do encryption themselves - it's the application that does it. That's where the e2ee boundary is.
Second, we've got e2ee communication between non-user entities as well. There's are servers using for example zerotier which communicate e2ee through other nodes. Third, applications can definitely send the data to other parties automatically. WhatsApp executing backups as configured does not make it not e2ee.