Yes, they absolutely should open source their backend systems. Is the value of Dropbox really in their source code? I doubt it. They want my files, all of them, but they won't tell me what they're doing with the files or how their code works?
Everything about this should be open source, and I won't ever use it until it is. Also they should make a lot more effort towards promising privacy and security. As it stands right now, they seem intent on handing your file access to governments and building systems that are insecure by design. No thanks. Open source and then we'll talk.
You aren't obligated to be a customer of Dropbox. There are plenty of other services, either self-run or not, that caters to people that value baseless paranoia over functionality and usability.
Have you read the news this year? There's never been a worse time to be unaware and unclear of what software installed on your device does. Companies are so bad at security they lose people's private information by the million, Dropbox themselves didn't even validate passwords for a four hour window once upon a time.
Everything about this should be open source, and I won't ever use it until it is. Also they should make a lot more effort towards promising privacy and security. As it stands right now, they seem intent on handing your file access to governments and building systems that are insecure by design. No thanks. Open source and then we'll talk.