Microsoft are getting a lot of pats on the back today for open sourcing MS-DOS. It might have meant something before FreeDOS was so well established and mature, but now... really, who gives a shit? Even more significant, they already "open sourced" it before, just not hosted on GitHub.

Here's the thing. Going open source is like losing your virginity. You only get to do it once, you can't take it back, and you certainly can't claim to be doing it again just because you're using a different host.