Agreed. The goal should be accurate market segmentation. Students, open-source devs, and hobbyists pay little or nothing, small shops pay some, and large enterprises pay more. Collaborator count seems to do that better than most metrics.

It is worth noting that GitHub organizes the Student Developer Pack[1] which comes with a Micro plan ($7 - max 5 repos). It means GitHub will offer unlimited public and private repos for 2-3 years for students who were selected.

[1]: https://education.github.com/pack

It says you will be able to add a few collaborators. So I think it will be very similar in the end.

Except that you have to pay for GitHub.

Which I already was. Now I'm paying less, and getting more.

But since they now are limiting the number of contributors to your private repos, you might as well use BitBucket for free.

I do, some? When I bumped up against the repo limit in GitHub, and didn't want to increase my account size. But it always felt like a cheap knock-off, so I don't spend much time there; generally I'd clear out an older repo, or just bump up my account.