How can we trust that the SF Conservancy, or its successors, won't do something untoward with the copyright assignment? Looking at their list of sponsors doesn't exactly assuage any such doubts as to their trustworthiness either.
"Something untoward" is a bit vague. You have to specify who's being threatened at the very least. * For project maintainers: The SF Conservancy can't prevent developers from working on their own project, because it is GPL-licensed and copyright holders can't retract GPL licensing once it's been given. * For end-users: The GPL is a copyright license, not a EULA. So it only affects developers. * For businesses that di…
No, they can't retract your permission to use your own software, but they can prevent you from going after infringing parties if SF Conservancy holds the copyright.
And at that point, why assign them copyright at all?