The screenshot you quote is about open source projects, not communities. If I understand correctly, even a large project like the Linux kernel has only a few hu

The screenshot you quote is about open source projects, not communities. If I understand correctly, even a large project like the Linux kernel has only a few hundred active developers at a time and the rest are one-time small-patch contributors. It would be interesting though to know how many students used slack for Harvard's online CS50 and how it worked for them.