Sometimes an idea comes out in a sequence of tweets, worth preserving in a blog post.
Reddit censoring sounds sort of sensible. What happens if Github starts? And before you all hand over blog posts to Medium, what if they do?
Giving any tech company exclusive rights to a media type is a bad idea. Sometimes we get something in return, e.g. YouTube.
Video files are huge. But an essay? Tiny. Repositories are tiny too. But there is some compute overhead for running a Git server.
When we collectively give one tech company ownership of a whole media type, we're making a deal with the devil. It can't end well.