Exactly. But an OSS community is very different from Twitter or Instagram. People will migrate to another website if Microsoft screws this up. Even if they don't screw it up, a lot of people are already willing to move because they hold grudges or are against a company like Microsoft owning the space.

If a GitLab or Gitea-backed community surfaces managed by a foundation, GitHub will be vulnerable.

Right now there isn't much of a point in moving to GitLab.com because they could be acquired as well.