This has to be HN at its worst. Reducing a complicated file sharing and collaboration tool to an insecure and highly technical protocol.

Dropbox: I can upload a file super easily and share a simple & secure link with someone who just has a web browser.

FTP: I can upload a file to an FTP server I've either configured on my server or rented online. I'll then provide an FTP url to friend with instructions on how they should login and what FTP client they should use on their chosen device.

EDIT: This could be sarcasm, if I didn't pick up on then feel free to downvote me to hell.

EDIT 2: Thanks to the comments, this is sarcasm. I messed up. Sorry rakoo.