You can't invent your own definition of end-to-end encryption. There is a material difference between a service which end-to-end encrypts your files – even if

You can't invent your own definition of end-to-end encryption. There is a material difference between a service which end-to-end encrypts your files – even if it sends you the code to do so – and one which does not. Services like Dropbox or WeTransfer receive plaintext copies of your files. Firefox Send did not. And Wormhole, using the same design, does not either.