[GammaDelta]

A common love/hate relationship I think; don't beat yourself up too much.

I think it's okay and even important to insist on open-source for a system like Plug even if you're not interested in using FOSS for all your computing. For many of the proprietary software examples you cited the "loss of freedom" is kind of nebulous (apart from the price tag!). The odds of a backdoor appearing in a product like Photoshop are relatively slim I think.

By comparison Plug is a perfect target - it is hosting documents and other data belonging to users who have likely made a conscious decision not to store it on the cloud. I don't think it's hypocritical to own a Mac and say that closed-source is not the right model for this application.