It’s not, because law enforcement considers your computer as private property, while anything you upload on the cloud is seizable without warrant. I’m not joking, it was rapported on HN at the time of the Snowden leaks that NSA can legally monitor your data as long as you transmit it over the wire.

The difference is the effort it takes. Deactivating E2E is just a flag.

There is no need to mess with the E2E, the client installed on your machine is downloaded form their servers, they can just copy the data when it is decrypted locally.

I does not make sense to use a proprietary internet connected application on your machine and worry that that the servers might be nefarious.

If your threat model includes getting hacked by the government, then your only choice of OS would be some hardened open source OS with fully reproducible builds and no proprietary driver blobs installed.

And in which you have personally audited every line of code for extra confidence. /s