Good points!

However, I'll gladly offer my support to a Free Software platform which still doesn't offer a way to export data, over a proprietary platform that already does.

After all, if the FLOSS platform doesn't offer that capability, is probably because nobody has coded it yet. And I couldn't support the proprietary platform, even if it offers nice things. Especially when it's such a "gravity force" as github.com is.

Regarding the Freedom -1, well... the problem here is that a remote service is a black box for the user, whether its source is Free Software or proprietary. But that's a whole other issue. Then again, you can run your own, say, GitLab, but you can't run your own GitHub.