What is the Cloud end 2 end encryption good for?

Ok i know what end 2 end encryption does.
my question is more about, in what situation is it any good when it comes to joplin.
If i choose to sync Joplin through one drive or dropbox.
will the encryption help me protect my privacy?

If you sync through Dropbox or OneDrive a complete copy of all your data is actually stored on Dropbox or OneDrive.

E2E encryption makes sure all that data is unreadable to the folks that run those services.

Allright Thanks!