You might be breaching the terms & conditions of their cloud stuff, but you could simply choose not to use it.
Open source protects the technical literate people, but it's not the silver bullet that solves this issue. Raising awareness and pushing back is at least as important and that's possible with closed source as well.
Yes, pushing back is possible with closed source as well.
The real question becomes, which is harder? and for who? To push back at closed source, you'd have to be a big consumer of them or atleast big enough to be able to sue the vendor. If you're an individual, you're in real trouble. Of course, there are people who play both roles.
And I see Open-source as the best enabler for technical individuals. As far as i can see, of course.