If they're still hashing files, its not end to end.
An anecdote, an activist had a document in their Google Drive. It was not something people high up wanted being distributed. It was deleted not just from their account, but platform wide. Guess how they did that? Its hash.
An anecdote, an activist had a document in their Google Drive. It was not something people high up wanted being distributed. It was deleted not just from their account, but platform wide. Guess how they did that? Its hash.