I feel like companies don't use Github as much as individuals. I've seen Azure DevOps used a lot, Gitlab right behind that, Bitbucket as a third option, however I've yet to work for company using Github organizations. And I don't blame them tbh, Github for organizations, has less feafures, but costs a ton more than other alternatives. Other thing i've notices is that sometimes, bigger companies have special deals with Microsoft, that for example include some Azure DevOps features for free.