I see Github as a mere tool. As I could use a proprietary operating system like Windows on my development computer, I can use Github to distribute the code. It doesn't have that severe consequence to the open source project itself and works well. And it's relatively transparent. Users can view issues etc without submitting to Microsoft. And it's been the standard for quite some time.
I'm far more concerned with FLOSS projects using platforms like Discord, which forces their users to surrender their privacy and that actively contribute to the enshittification of the internet. I wouldn't want to be part of that.