It was very well said by gwf: This is a race to the bottom in terms of sustainable pricing. I love the free plan but who knows how it'll play long term.
I'm a happy paying customer with 10 users and dozens of repositories. We're an agency, work on a lot of different projects, and having price be O(people) instead of O(projects) makes lot more sense for us.
As amazing as it may sound on HN, GitHub isn't best for everyone. Therefore, there are ways to compete with them that aren't price-based.