Encryption is done at the client level, not the account level. Yes, a large majority of Google and MS users probably use the web uis of the service itself, or G

Encryption is done at the client level, not the account level. Yes, a large majority of Google and MS users probably use the web uis of the service itself, or Google/ms clients, but the point is that switching client doesn't mandate switching provider. You can even manage your Google account via a 3rd-party web ui.